In the passage about global warming, select the most appropriate option to fill in blank number 4: Global warming is a major problem. The result will ...

In the passage about global warming, select the most appropriate option to fill in blank number 4:

Global warming is a major problem. The result will be the problems created by the rising temperatures of the Arctic region. As a result
of global warming, (1)_________ in rainfall and plant distribution affect the migration patterns, feeding behaviour, and breeding
preferences of numerous bird species. The increase in the temperature may also alter ocean currents, which may alter the
(2)__________ ecology as a whole. Greenhouse gas emissions are responsible for the ongoing melting of the Arctic. This will result in
a (3)loop since greenhouse gases trap the heat in the atmosphere and the additional emissions may (4) the
global warming process. Now, the only way to reverse the harm is for every person to be environmentally sensitive. This may offer us
hope that we will be able to leave a green planet to our future generations, who presently appear to face (5)__________.