Question

In the following passage fill in each of the
numbered blanks with the correct form of the
word given in the brackets:
Global warming is an increase in the everage
semperature worldwide 1) ...... (believed,) to be
caused by the greenhouse effect. Earth has
undergone periods of gradual warming and
cooling throughout its existence due to natural
CHUSS such as volcanic eruptions and variations
in the Sun's output. However, the scientists
2 .......(artribute) the current increase in the
global temperatures to human causes
primarily the release of certain guses are the
atmosphere as a result of industrial activity. The gases 3........
(name) greenhouse gasse.
assimilate and trap the heat generated from the
Earth's surface through a phenomenen known
as greenhouse effect
The greenhouse ettect (4)...
(be)
natural process thar (5)......
(help)
maintain temperatures suitable for life without
it our earth would be (6)....... (freeze) and
probably an uninhabited planet. However, the
environmental scientists (7)....... (determine)
that increased concentration of greenhouse
gases resulting from human activity ........
(amplify) the natural green house gases causing global warming ​

Answer 1

Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.