0 + 0 + 0 + 0

= 0 x 4

= 0

k mik nha bn

thanks you

The Earth has been getting warmer in the past 100 years. It (28)……..global warming. (29)……. 1992, the warmest temperatures have been recorded on the Earth each year. Scientist tried to find out (30)……. the Earth was becoming warmer, (31)…….they studied the oceans and the air to understand the reasons. They found out that human beings caused temperatures to go up. People have been burning fossil fuels like petroleum, coal and natural gas. As the world became industrialized and the (32)……grew, people burned more and more fossil fuels.