Very true. I think it's sensible to look at it from the viewpoint that mankind without a doubt has had a massive impact on the planets environment and ecosystems and that has likely contributed to climate change as we are part of the cycle of nature. Also on the other hand it would be extremely arrogant of mankind to assume that we are all so powerful beings that we have the ability to single-handedly change our climate for better or worse. Nature teaches us every day that we are powerless against it's force.
Nature works in a fine balance and mankind may have rocked the boat so to speak in terms of the balance, and once we are gone nature will continue to do what it does to maintain it's balance again. There have and always will be fluctuations and changes from what maybe perceived to be the norm and cycles within the earth's climate.
Sadly for mankind our inherent characteristics of individual or small group survival, greed, lack of collective spirit, competitiveness and fight or flight responses and lack of togetherness at the highest level as one group of countries and nations to tackle the issue as a human race will mean that we will never be able to work in unison to make a collective change. All we can do is as individuals is try and play our own part by having an awareness of the issues and assess our own environmental impacts and use of resources and make informed decisions that may go a small way in doing our bit to help.