It is the affect of the destruction of the atmosphere and the pollution of the world causing it to heat up, causing more droughts, and the melting of polar caps. It damages the ecosystems and biomes many animals depend on.
Answer: To my understanding, it's when things like fossil fuels enter the atmosphere and start warming our planet, and there are all these effects like the ice caps melting, climates getting hotter, I'm pretty sure it's ruining our atmosphere (but don't quote me on that) it's not good.
