In this paper we discuss global climate change mitigation that builds on existing unilateral actions to deliver ever deepening emission cuts over time. A wide array of unilateral environmental measures have been documented. We discuss the rationale for such measures and argue that unilateral initiatives have the potential to generate positive spillover e¤ects both within and across countries. Using a simple dynamic model of learning, we show how global negotiations can accelerate convergence to a global low emissions regime by building on and strengthening the positive spillovers inherent in unilateral initiatives. \ud \u
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