Well, there are many signs to tell if the earth is warming. For instance the average temperature of the ocean is increasing along with the sea level. Why? Because the earth is warming that means that the glaciers are melting and that makes the sea level rise. It’s kind of like a glass of water with ice cubes in it. And when the ice cubes start to melt, the water rises. Also the temperature on land has increased. Because of the fossil fuels that are bouncing back to the earth. That’s why in places where it’s suppose to freezing cold with a whole bunch of snow there’s nothing. I’ve seen this go down. I come from a small city in New York that’s right next to Canada. Lake Champlain is right next to it. The water would freeze over, it was very sturdy, enough to drive your vehicle out to the middle of the lake and ice fish, now not so much. Also, when I was little there would be school cancelations because the amount of snow we would get in one day. Not so much anymore. We get some snow and slushing and sometimes freezing rain but that’s it. You could probably notice some changes as well. Maybe you’re from a hot area. Maybe the seasons seem to be warmer than you remember.