Reasons-Responsive Theories and the Nature of Reasons

In the contemporary free will debate between compatibilism — the thesis that free will is compatible with determinism, and incompatibilism — that free will is incompatible with determinism, many scholars are sympathetic to compatibilism, yet disagree in how the position is best characterized. As one of the most important branches of source compatibilism, reasons-responsive theories attempt to address an important issue, namely, what type of person can be regarded as moral agents. There are several controversial points within the theory. This paper aims to show that reasons-responsive theories fail as a solution to the free will debate, to the extent that they remain silent on the issue of the nature of reasons. It is this silence and inadequacy that constitute a rebuttal to reasons-responsive theories. In what follows I will propose a dilemma to reasons-responsive theories: if moral reasons are objective in the sense that one could be wrong about them, it appears that one must be a moral expert to possess the so-called “reasons-reactivity”, a necessary condition for the possession of free will. This will later be shown to be deeply implausible. If moral reasons are instead subjective in the sense that whether one has a moral reason to do X crucially depends on his mental states, then reasons-responsiveness seems to have no connection with free will at all. In addition, there are independent grounds on which the subjective account of the nature of reason can be challenged. Therefore, no matter which road reasons-responsive theorists choose to go down, there are serious objections that cast doubt on their plausibility. At the end of the paper, I will touch on the question of why reasons-responsive theories are doomed to failure due to their lack of concern with the agent’s own psychology

Acidification Offset Warming-Induced Increase in N₂O Production in Estuarine and Coastal Sediments

Global warming and acidification, induced by a substantial increase in anthropogenic CO2 emissions, are expected to have profound impacts on biogeochemical cycles. However, underlying mechanisms of nitrous oxide (N2O) production in estuarine and coastal sediments remain rarely constrained under warming and acidification. Here, the responses of sediment N2O production pathways to warming and acidification were examined using a series of anoxic incubation experiments. Denitrification and N2O production were largely stimulated by the warming, while N2O production decreased under the acidification as well as the denitrification rate and electron transfer efficiency. Compared to warming alone, the combination of warming and acidification decreased N2O production by 26 ± 4%, which was mainly attributed to the decline of the N2O yield by fungal denitrification. Fungal denitrification was mainly responsible for N2O production under the warming condition, while bacterial denitrification predominated N2O production under the acidification condition. The reduced site preference of N2O under acidification reflects that the dominant pathways of N2O production were likely shifted from fungal to bacterial denitrification. In addition, acidification decreased the diversity and abundance of nirS-type denitrifiers, which were the keystone taxa mediating the low N2O production. Collectively, acidification can decrease sediment N2O yield through shifting the responsible production pathways, partly counteracting the warming-induced increase in N2O emissions, further reducing the positive climate warming feedback loop