Anti-capitalists aren't bandwagoning anything. Leftists like Murray Bookchin have been writing about environmental issues since the 60's. There's no point in building a classless worker's utopia if it all gets destroyed by global heating.
Not to mention global heating is caused by industrialization, which was brought on by capitalism, and just 100 companies are responsible for 71% of greenhouse gas emissions. I think there's a strong case to be made that the shift to a de-carbonized economy will require drastic changes to our economic system.
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