People still live only around 100 years or less. Saving the planet doesn't mean anything to the dead. Besides, if you can't save the planet (which you can't), why waste time on it? First learn how to live potentially for 1,000 years. Then, after 200 years, you might gain enough wisdom and knowledge to do a little to save the planet.
Well, the person knows that he can live a maximum of 100 years and not sweat about saving the planet. He wants to live to the fullest and do not deny himself anything, do not bother with all kinds of global warming. Sometimes someone can think about saving the planet, but he will not want to lose his precious time to take everything from this life.