Do we control everything that happens on Earth? Of course not. Do we have more influence on it than every other species put together and have we changed its appearance more in the past 200 years than in any time frame of about 2 million years ever, possibly excepting the ones leading to the previous mass extinctions? Quite obviously yes. Anyone coming back even from Georgian times would be stunned to see what the world looks like now.
So climates have always changed and ices ages have come and gone - sure, over the course of millions of years. Actually we're still in one FWIW. Unfortunately this has not occured when 7 billion humans were all trying to live or attain a resource-intensive lifestyle. Uless you're implying that if climate change dictates that most of the world should starve so be it, I don't see where this leads us.
What environmentalism we have about us now is human-centric and personally I think that's fine. We want to 'save the planet' for ourselves and our descendants, not because we are so arrogant as to think it will cease to exist or so perfect as to care about every last unknown species. That's an honest recognition that humans rule this planet and it isn't going to change.
Finally, the idea that we will only start thinking about renewables when the last drop of oil and gas is gone is absurd. It's happening right now; that's a stone cold fact that my work as an industry journalist teaches me every day. The pace of develooment in solar power,for instance, is quite staggering. Industry has long since 'got' it. Even those like Exxon which scoffed away renewables just a few years ago.
Naturally, as increasingly scare resources get more expensive, some will make hay while the sun shines and those who can afford them most will pay for them and others will go without. It's not right but neither is it some global conspiracy, just politics as it always has been and probablhy always will be.