In plain man's terms, global warming is how we define the gradual, yet continuous warming of the earth which is mostly caused by man. That gradual, yet relentless warming, is harming the animals, plants, microbes, fungi, people, and all other living things, because it causes climate change.
I 100% know that global warming is a real problem that we have the ability to control, yet won't. My plants are acting all weird outside by coming up to early. My cat had a tick in January. None of that is normal. I know our grandparents can site similar oddities that happened back in their day, but they still remember it because it was so odd. For us, this is the new normal. It's not a one-off. My plants are coming up earlier and earlier and they're dying off earlier and earlier too as they can't take the heat. I wish the USDA would draw new maps.