When it’s a good thing:
Given that climate change is a mixture of curses and blessings, any policy addressing it is going to involve trade-offs. Slowing it down, for example, would hurt some, help others. It’s not clear why a cold, Arctic-reliant country like Russia whose economy is linked to the oil and gas trade would find a benefit in cooperating with efforts to stop climate change. It also appears that human activities like farming are better able to adjust to temperature variations than some pessimists would have us believe. Crops like soya, corn and wheat can be bred (or genetically modified) to grow in warmer and dryer conditions at a modest cost.
Greens, many impelled by emotional overreactions or a deep inner belief that unfettered capitalism is a terrible thing, have tried to simplify the discussion about the earth’s changing climate into a morality play. They’ve overstated the evidence that favors worst-case scenarios, argued for top down, bureaucratic solutions that don’t work, and when critics object to these policies they lash out at their critics as ‘science deniers.’
Because they have other agendas, and because for them, it’s a religion. You can pay for a hell of a lot of mitigation with all of the wealth that’s being opened up in the Arctic, but it doesn’t give them the requisite amount of control.