Essays / a report on a world issue - GLOBAL WARMING!! [9]

Hello my name is sarah anderson. I'm a junior this year and our whole class has to do a report on a world issue. I chose Global warming. i have my out line and everything wrote out i just need help writing my intro and thesis statement i have it wrote out but i want to see if its good. please help me its due monday!! Here it is:

Global Warming also known as the green house effect, has received much attention in the past years; but yet our climate isn't a problem yet. It has been shifting over many years. What is increasing in our world is the rate of change; it's accelerating due to the growth of our civilized population. The flowering of our population has increased our use of fuel, and manufacturing. All of these are rising transmissions into out world that increases global warming.