متن اصلی - انگلیسی - The Earth is warmed naturally by gases in the...

The Earth is warmed naturally by gases in the atmosphere trapping heat from the Sun. The Earth's climate has changed considerably in the past.
-An increase in global temperature could lead to major problems for mankind;
-Sea levels could rise, flooding low-lying coasts;
-Different weather patterns could affect agriculture and food production;
-and forced migrations of people could affect peace and international security.