The International Monetary Fund chief has hailed the landmark agreement reached in Paris "a critical step forward" for addressing global climate change in the 21st century and said her key message is to "price carbon right."
Governments must now put words into actions, in particular by implementing policies that make effective progress on the mitigation pledges they have made.
Charging for the emissions of fossil fuels puts in place the needed incentives for low-carbon investments; it also provides revenues to safeguard the poor, reduce debt, and lower the burden of other taxes on households and businesses.
George Osborne was warned he could be breaking law with cuts to investment in renewable and green energy
Prime Minister David Cameron has welcomed the final approval on an historic international deal to tackle climate change.
WWF-UK's chief executive, David Nussbaum, writes for ITV News after the release of the final draft of the Paris Agreement on climate change.