文档介绍：1
Glo
bal War
ming
2
1
2
3
4
Background
Reason
Problem
Solution
目录
CONTENT
3
The
climate
has
been1
Glo
bal War
ming
2
1
2
3
4
Background
Reason
Problem
Solution
目录
CONTENT
3
The
climate
has
been
getting
stea
dily
warmer
and
warmer
in
recent
years.
Background
1
4
The average global temperature
rises
significantly after entering the eighties
Global warming is
coming !!!!
5
There are many reasons of the
global warming, but it mainly
caused by human activities
Reason
2
6
Initial causes of
temperature
changes
3
4
2
1
Aerosols and soot
Greenhouse gases
Variations in Earth's orbit
Solar activity
7
Fossil
fuel
burning
land-use
change
Population
growth
1
Greenhouse gases
CO
2
8
In addition to their direct effect by scattering and
absorbing solar radiation, aerosols have indirect
effects on the Earth's radiation budget.
2
Aerosols and soot
9
3
Solar activity
The sun
'
activities cause
volcanic eruption , and produce a
large number of ash
10
4
Variations in Earth's orbit
Variations in orbital cycles may initiate
a new glacial period in the future,
though the timing of this depends on
greenhouse gas concentrations as well
as the orbital forcing.
11
Global warming causes all sorts
of problems
Problem
3
12
Extreme weather
Sea level rise
Long-term effects
Ecological systems
1
2
3
4
13
Extreme
weather
Projections suggest a probable increase in the frequency and
severity of some extreme weather events, such as heat waves
，
Elnino
（厄尔尼诺）
, drought, floods, thunderstorms, hail
（冰
雹）
, storm, the heat and dust storms
14
Sea
Level
Rise
19th century
——
rise at the rate of to per
one hundred meters
Ice, islands, city disappear
Bring disaster to the coastal areas
15
Terrestrial
（陆地
）
ecosystems
threaten coral reefs,
fisheries, protected
species, and other
natural resources of
value to society
Effect the flight of the
migra