INTRODUCTION

Global warming is becoming a serious concern for all inhabitants of the planet Earth. Gradually over the years, our climate has been warming up. Some people who live in the Northern Hemisphere think "That's okay with me. Our summers are too short anyway". However, even a minor change in the Earth's temperature of only a few degrees can result in dramatic changes to our climate.

During the last Ice Age when most of the Northern Hemisphere was covered in glaciers, the average temperature of our planet was only 2 to 3 degrees colder than what it is today. Doesn't sound like much, but the result was that much of Canada was covered in ice up to a few kilometres in depth.

So imagine what could happen if our average temperature was to rise by a couple of degrees!