The Friends of the Earth chief executive has warned the deal fell far short of the "soaring rhetoric" from 150 world leaders who attended the opening day of the talks.
An ambition to keep global temperature rises below 1.5C is all very well, but we still don't have an adequate global plan to make this a reality. This agreement leaves millions of people across the world under threat from climate-related floods, droughts and super-storms.
However, this is still a historic moment. This summit clearly shows that fossil fuels have had their day - and that George Osborne's outdated, backward energy policies must be reversed if he wants to be on the right side of history.
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.