Acceleration of global warming

Recently, global warming is becoming more and more serious problem around the world. According to some glacial scientists, the ice of the Arctic melts much faster than their expectation. They indicates that there will be no ice in the Arctic Ocean in 2020's summer! It's a shocking news for me... The ice in the Arctic Ocean is very helpful in cooling down the earth. But if it melts in summer, global warming will proceed more rapidly. Now we should consider about this problem deeply.