Climate change is caused by humans emitting greenhouse gases into the atmosphere. CO2 is released into the atmosphere by burning processes within industry. It stops heat from reflecting back into space and is warming the earth. 

For example:

Polar Ice is melting at alarming rates and causes the habitat of the Polar Bear to melt into the sea. They have to swim higher distances in search of food and land. Due to this they become exhausted and sometimes die. In addition to this Polar ice starts freezing later every year and melts earlier then it used to.