Ok, first off, it is spelled "global warming" and "people".
Now that we have that covered, we can proceed.
Here's a simple definition of global warming. (And yes, it's really happening.) Over the past 50 years, the average global temperature has increased at the fastest rate in recorded history. And experts see the trend is accelerating: All but one of the 16 hottest years in NASA’s 134-year record have occurred since 2000.
Climate change deniers have argued that there has been a “pause” or a “slowdown” in rising global temperatures, but several recent studies, including a 2015 paper published in the journal Science, have disproved this claim. And scientists say that unless we curb global warming emissions, average U.S. temperatures could increase by up to 10 degrees Fahrenheit over the next century.
We can reduce it by using less non-renewable resources, recycling, using less water when taking a bath or brushing your teeth, and biking or walking instead of driving a vehicle. If you would like to know more of what you can do, I suggest you look it up. :)