"Write a tweet thread explaining climate change simply"

1/ Climate change explained in 5 tweets: 2/ Earth has a natural blanket of gases (CO2, methane) that trap heat from the sun. Without it, we'd be a frozen rock. This is the greenhouse effect—it's been keeping us alive for millions of years. 3/ The problem: Since the Industrial Revolution, we've been burning fossil fuels (coal, oil, gas) and adding WAY more CO2 to that blanket. Thicker blanket = more heat trapped = Earth gets warmer. 4/ The numbers: CO2 was stable at ~280 parts per million for 10,000 years. It's now over 420 ppm—higher than any point in 800,000 years. We did that in about 150 years. 5/ The effects: Rising temperatures mean melting ice, rising seas, stronger storms, longer droughts, and ecosystem collapse. Not in some distant future—happening now, accelerating. 6/ The good news: We know exactly what's causing it, which means we know how to slow it. The technology exists. The question is whether we'll use it fast enough.