When Grandpa says
Why do all you greenies just want us to live in caves and burn leaves for light?

You can say
Millions and millions of Americans just want to leave this planet clean for their kids and grandkids. Why burn dirty coal that sickens our families when we can get clean energy from the sun and the wind?

Why remain addicted to fossil fuels like oil and coal when we can continue investing in clean energy that boosts our economy and creates jobs?

When Grandpa says
You environmentalists are so melodramatic, making a big fuss over nothing. Everything is fine.

You can say
Climate disruption is the largest threat that our natural heritage has ever faced. Coal mining continues to destroy a way of life that your generation enjoyed.

We have a responsibility to protect wildlife and wild places so that future generations can enjoy the same special places that we did. If we don't -- who will?