Corporations cannot change anything on their own if they operate in capitalistic economy. They are doing exactly what's expected of them to maximize the profit.

If you change your lifestyle significantly, you are not just a blip in statistics. Your actions rub off on other people, your vote supports the right people, and with enough time you help the right mindset to prevail.

Besides, presuming you are not climate change skeptic, what other rational choice do you have?