I keep reading that. But it's not that simple. Corporations provide what individuals want. Their exploitation of the world's resources and the damage to the climate is a side product of that. They aren't a completely separate entity that do what they do just to be evil.
Governments need to heavily restrict corps and how they operate. Which will come with increased prices and limitations to the people. Which is unpopular and will mean that those politicians won't get back into office...
Which is why nothing will happen and we are all fucked
Do you vote? Because it's the same principle - how one person votes might be irrelevant, but millions of people voting is powerful. This is true even though corporations have outsized influence on the political process.
Likewise, a single person deciding to not eat meat one day a week or replace one car journey with cycling is nothing in the global scheme of things, but a billion people all doing it will have more impact on the environment than any corporation ever could.
I see your point, though I think the comparison isn't quite accurate. My one vote doesn't get canceled out many times over by the vote of a billionaire (though I suppose you could argue that lobbying by that billionaire could indeed cancel it out.
I guess I'm just growing pessimistic. For as much as I personally do, I feel its a drop in the water that is negated 1000 times over by corporations and wealthy individuals. I'm also tired of the narrative being focused on individual effort instead of pressuring corporations etc. to take more responsibility. But both individual and corporate/government action are needed, I suppose, if we're going to save ourselves...