Global Warming

 I think one of the worst problems affecting the environment is global warming.Global warming is that temperature of Earth start to increase.We sometimes feel it.It happens around the world.For example,in Carlgary it is not too cold this year compete to last year.In Japan,recently it is very hot in summer.A few years ago,average of temperature is about 30 degree in summer.But nowdays there are some place that it is over 40 degree.We noticed something happens.
 What do global warming cause??First,ice in Arctic is malting up,and then sea levels to rise.Finally,some island will sink under the water.Other effects of warming can change an ecosystem.This change ralate to species extinctions.
 Some researcher try to slove these problems.Some researcher say CO2 cause global warming,so they suggest that people should decreese CO2.Such as,we try to use public transit instead of useing a car.But other say that it dosen't matter.
 We still not find the solution.But we will find it soon,and we will need a effort each person. at that time.Not only we leave it to resercher,but also we have to think abou it.