In a fragmented global environment, the efforts of state and non-state actors are important in assessing the state of play on climate change mitigation actions around the world. This article will consider from a comparative perspective the various legislative models for addressing climate change and the reduction of GHG emissions with particular focus on the EU, USA, Australia and Switzerland. As legal developments are not limited to legislative schemes, this article will examine the voluntary carbon offset market and other trade related solutions to GHG emissions which have emerged in the absence of mandatory limitation systems. Also warranting attention are the actions of private parties in common law jurisdictions to bring legal proceedings against power companies for damage caused by climate change. Together, these developments demonstrate that climate change abatement is not the sole remit of the legislature.