Naomi Klein released her latest book, This Changes Everything, as more than four hundred thousand people joined the People’s Climate March in New York City and environmental activists around the world organized 2,646 solidarity protests in 162 countries, making it by far the largest climate justice march in history.

Growing mobilizations, particularly among indigenous and rural communities, against fossil-fuel extraction — fracking, tar sands, offshore oil, coal — and resistance to pipelines from Michigan to Texas have resulted in escalating state repression and propaganda campaigns from energy companies. Two people were killed worldwide every week in 2014 because of their environmental activism — more than double the rate of similar killings earlier in the decade.

These mobilizations, and the people’s willingness to risk their lives for environmental justice, are rooted in a broader consensus — excepting Republican presidential hopefuls — on the scale and immediacy of the climate crisis. The Global Humanitarian Forum estimates that climate change is already responsible for more than three hundred thousand global deaths annually, affects a wider 300 million people, and is a major driver of humanitarian crises.