It's seven million years ago. On the eastern African coast, our ancestors have left their cradle in the treetops for the hearty food on the sea floor. Over time they slowly start to change. They even begin to stand upright from wading in the water. But something else is changing too. The Earth is ...
For example, the Arctic, which is the polar bear's home, is experiencing the effects of global warming more than any other places. As the temperature is increasing, ice sheets are becoming smaller and fewer; as a result, polar bears have to spend more time on swimming in the sea to find icy places for hunting and living, which impacts their reproductive capacities and the cubs' chances of survival (NatureCANADA.ca, 2012). The fact is that the population of polar bear has declined by 22 percent over the past decade (NatureCANADA.com, 2012). ...
In the Sahel of Africa, climate change has caused many trees to die back, exposed sandy soils to wind erosion, and shifted the vast ecological zones of the Sahel, Sudan and Guinea 3southward towards the Equator. The changes of seasons have altered the life cycle events of plants and animals. Climate...
Bears feed on salmon to fatten up for hibernation. ... As you head towards poles, the temperature starts dropping and eventually reaches the freezing point in the polar areas. Other than the absence of sunlight for half the time of the year, the presence of icebergs in water is also responsible for the water in polar areas being freezing cold. ...
