Bundling and stacking in bio-sequestration schemes: Opportunities and risks identified by Australian stakeholders

The stacking and bundling of ecosystem services credits has emerged as mechanisms to promote the conservation of biodiversity in carbon sequestration schemes. Globally, apart from a few certification standards in the voluntary market, little genuine action has eventuated, but actors in these markets are continuing to examine the idea of combining carbon and biodiversity credits. This paper provides the first empirical analysis of the opportunities and barriers of bundling and stacking carbon and biodiversity credits as articulated by policymakers and academics, in Australia. Corporate social responsibility (CSR) acts as a driving force for business interest in the co-benefits of carbon plantings; however, uncertainty in the market and policy settings act as barriers for both buyers and sellers. Interviewees highlighted substantial benefits of both bundling and stacking, including easing transaction costs for landholders, reduced monitoring costs for regulators. Nevertheless, there is a risk that stacking can affect the perceived additionality of carbon plantings, which has the potential to erode the integrity of carbon markets. Obstacles to the establishment of stacked/bundled markets include the lack of standards to show that co-benefits are real, dealing with the additionality rule, and designing scenarios to achieve genuine outcomes for both biodiversity conservation and carbon abatement

The ethics of offsetting nature

Biodiversity offsetting is transforming conservation practice around the world. Development activities that degrade or destroy biodiversity at one location are now increasingly acceptable because of compensatory environmental gains generated elsewhere. This change represents a major shift in how nature is protected, and yet its philosophical justification has received little attention. We argue that biodiversity offsetting aligns most easily with a utilitarian ethic, where outcomes rather than actions are the focus. However, offsetting schemes often neglect to account for the multiple values that people assign to biodiversity including unique, place-based values. Furthermore, the implications of defining nature as a tradeable commodity may affect our sense of obligation to protect biodiversity. Ironically, offsetting may exacerbate environmental harm because it erodes ethical barriers based on moral objections to the destruction of biodiversity. By failing to consider the ethical implications of biodiversity offsetting, we risk compromising the underlying motivations for protecting nature

The role of social networks and trusted peers in promoting biodiverse carbon plantings

Social capital has the potential to influence the success of biodiverse carbon plantings in the face of uncertainty amongst rural landholders about the need or efficacy of efforts to address climate change through tree planting. We conducted 17 face-to-face semi-structured interviews with landholders in Victoria, Australia who voluntarily participate in biodiverse carbon plantings on their land, focussing in particular on the role of social capital for understanding how 'early adopters' can advocate for programs locally. Interviews revealed the importance of social networks and the profound impact of trusted peers on the diffusion of carbon planting schemes. Social capital dimensions are especially important for shaping ongoing participation and the ways that participants become active agents in trusted relationships that influence participation of others. Our results suggest that positive impacts of social networks can counteract doubts about the validity of climate adaptation responses such as carbon planting, and enable landholders to connect the program with existing stewardship motivations. The ability for early adopters of the program to demonstrate the physical materialisation of their plantings to others was vital to this process. We propose that targeting champions and trusted peers in local communities could accelerate the proliferation of biodiverse carbon planting schemes

Generalized percolation in random directed networks

We develop a general theory for percolation in directed random networks with arbitrary two point correlations and bidirectional edges, that is, edges pointing in both directions simultaneously. These two ingredients alter the previously known scenario and open new views and perspectives on percolation phenomena. Equations for the percolation threshold and the sizes of the giant components are derived in the most general case. We also present simulation results for a particular example of uncorrelated network with bidirectional edges confirming the theoretical predictions

Exploring the permanence of conservation covenants

Conservation on private land is a growing part of international efforts to stem the decline of biodiversity. In many countries, private land conservation policy often supports in-perpetuity covenants and easements, which are legally binding agreements used to protect biodiversity on private land by restricting activities that may negatively impact ecological values. With a view to understand the long-term security of these mechanisms, we examined release and breach data from all 13 major covenanting programs across Australia. We report that out of 6,818 multi-party covenants, only 8 had been released, contrasting with approximately 130 of 673 single-party covenants. Breach data was limited, with a minimum of 71 known cases where covenant obligations had not been met. With a focus on private land conservation policy, we use the results from this case study to argue that multi-party covenants appear an enduring conservation mechanism, highlight the important role that effective monitoring and reporting of the permanency of these agreements plays in contributing to their long-term effectiveness, and provide recommendations for organizations seeking to improve their monitoring programs. The collection of breach and release data is important for the continuing improvement of conservation policies and practices for private land

Incorporating detectability of threatened species into environmental impact assessment

Environmental impact assessment (EIA) is a key mechanism for protecting threatened plant and animal species. Many species are not perfectly detectable and, even when present, may remain undetected during EIA surveys, increasing the risk of site-level loss or extinction of species. Numerous methods now exist for estimating detectability of plants and animals. Despite this, regulations concerning survey protocol and effort during EIAs fail to adequately address issues of detectability. Probability of detection is intrinsically linked to survey effort; thus, minimum survey effort requirements are a useful way to address the risks of false absences. We utilized 2 methods for determining appropriate survey effort requirements during EIA surveys. One method determined the survey effort required to achieve a probability of detection of 0.95 when the species is present. The second method estimated the survey effort required to either detect the species or reduce the probability of presence to 0.05. We applied these methods to Pimelea spinscens subsp. spinescens, a critically endangered grassland plant species in Melbourne, Australia. We detected P. spinescens in only half of the surveys undertaken at sites where it was known to exist. Estimates of the survey effort required to detect the species or demonstrate its absence with any confidence were much higher than the effort traditionally invested in EIA surveys for this species. We argue that minimum survey requirements be established for all species listed under threatened species legislation and hope that our findings will provide an impetus for collecting, compiling, and synthesizing quantitative detectability estimates for a broad range of plant and animal species

Wildlife gardening for collaborative public-private biodiversity conservation

Complementary public and private conservation action is required to sustain native biodiversity in cities. Residents can contribute by wildlife gardening - removing environmental weeds, cultivating indigenous flora, and improving habitat in their gardens. There is currently little guidance about how best to involve residents in wildlife gardening and align their work with public land management. We explored how a purposively chosen wildlife gardening program in Melbourne, Australia engaged and supported residents to augment local government efforts to conserve indigenous biota. Sixteen semi-structured interviews were conducted with program members to understand the program's impact on their gardening and their connections with their council and community. Unpublished Council survey data were used to position interview findings on wildlife gardening activities and the value of program features. Interviewees detailed how they modified their gardening to assist their council to conserve indigenous biota. Five program features were implicated in this change: (1) on-site garden assessment; (2) indigenous community nursery; (3) communication hubs; (4) a framework that fosters experiential learning and community linkages; and (5) endorsement of each garden's potential conservation contribution. Collaborative wildlife gardening programs can engage residents to manage their land to achieve landscape-focused conservation goals while building relationships with council and community

The use of dynamic landscape metapopulation models for forest management: a case study of the red-backed salamander

Spatial models of population dynamics have been proposed as a useful method for predicting the impacts of environmental change on biodiversity. Here, we demonstrate advances in dynamic landscape metapopulation modelling and its use as a decision support tool for evaluating the impacts of forest management scenarios. This novel modelling framework incorporates both landscape and metapopulation model stochasticity and allows their relative contributions to model output variance to be characterized. It includes a detailed sensitivity analysis, allowing defensible uncertainty bounds and the prioritization of future data gathering to reduce model uncertainties. We demonstrate this framework by modelling the landscape-level impacts of eight forest management scenarios on the red-backed salamander (Plethodon cinereus (Green, 1818)) in the boreal forest of Ontario, Canada, using the RAMAS Landscape package. The 100 year forest management scenarios ranged in intensity of timber harvesting and fire suppression. All scenarios including harvesting predicted decreases in salamander population size and the current style of forest management is predicted to produce a 9%-17% decrease in expected minimum population size compared with scenarios without harvesting. This method is amenable to incorporating many forms of environmental change and allows a meaningful treatment of uncertainty

Generation of uncorrelated random scale-free networks

Uncorrelated random scale-free networks are useful null models to check the accuracy an the analytical solutions of dynamical processes defined on complex networks. We propose and analyze a model capable to generate random uncorrelated scale-free networks with no multiple and self-connections. The model is based on the classical configuration model, with an additional restriction on the maximum possible degree of the vertices. We check numerically that the proposed model indeed generates scale-free networks with no two and three vertex correlations, as measured by the average degree of the nearest neighbors and the clustering coefficient of the vertices of degree $k$, respectively