The head of one of the world's major environmental groups has told FRANCE 24 that a third major crisis is affecting the world and we need to pay more attention to it. As well as Russia's full-scale invasion of Ukraine and the crisis in Gaza, she says we need to urgently address climate change. Pam Pearson, the founder and director of the International Cryosphere Climate Initiative, says that just a 2°C degree rise in temperatures would mean that all of the Earth's frozen regions would experience "irreversible" damage, with disastrous consequences for millions of people and for nature. Her organisation says that already a 3-metre rise in sea levels can no longer be stopped, but that if we act now it can be slowed so it takes up to a thousand years to happen. Pearson, a former US diplomat with 20 years of experience working on global issues, spoke to us in Perspective.