The sea ice is melting in the Arctic in an increasingly faster rate than many scientists had thought. The main reason of the sea ice deglaciation human activity. Greenhouse gas emissions have increased in recent years, which have contributed to the rise in temperature over the earth. Other researchers argue that it is the result of natural climate variability. Sea ice reduction will affect both the Arctic climate and environment. Ecosystems that depend on sea ice will have to adapt and the people who live in the Arctic will have to change their lifestyles. Since 1979, sea ice has reduced its prevalence, and 2007 sea ice reached a record low minimum. Climate models show that in year 2050 the Arctic Ocean could be sea ice-free. A warmer climate will have effects on the climate system affecting sea ice and the rest of the world. For example, the thermalhalina circulation will be affected, due to sea ice loss, which will have significant impacts on Earth's climate.