Of course we do. Anyone who thinks that human progress hasn't taken it's toll on the planet is either incredibly naive, completely unaware that equations will balance, or in the pocket of one of the entities who are pillaging the planet and selling the spoils back to it's inhabitants.
There are, of course, natural factors at work also... it's not all people.
But to say that the technology created by people (to include burning wood for heat - a long time ago) has no effect on the planet are truly fools and should not be allowed a place at the "big people's table" when it comes to talking about what the causes are for climate change and what can we do, if anything, to change it's outcome.