Global warming is about climate, not weather.
That is, just because it was cold yesterday where you live doesn't mean that global warming doesn't exist. It's about the temperature of the world as a whole, not just your town.
In case you hadn't noticed, the temperature is not the same across the earth's surface. With global warming there are still hot spots and cold spots (and they may move around a bit and some places might actually get colder), but overall the earth is getting warmer.
Still having trouble understanding it?
OK, let's try a simple example.
Let's say you have a two-story house with a basement. Since we're in America, let's also assume our temperatures are measured using the Fahrenheit scale. Your house has a thermometer on each floor: the basement, the first floor, and the second floor.
In the past the thermostats read 68, 70, and 72, respectively. So the average temperature in your house was 70 degrees.
Lately though the thermostats read 70, 69, and 74 degrees. It's warmer in the basement and second floor, but cooler on the first floor. The average temperature is now 71 degrees.
The people in the basement might be happy now that they can stop wearing a sweater. But the people on the first floor are angry because it's too cold to grow their house plants now. And the folks on the second floor are constantly cranky because they can't keep their beer cold.
Won't be long before the various tenants start an altercation and the cops get called...
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