MAINSTREAMING CLIMATE CHANGE ADAPTATION IN AGRICULTURAL EXTENSION
Slide 7
What‟s happened to the
greenhouse gases?
Slide 10
2012
Climate with natural forcings &
man-made emissions
Source: IPCC AR4, working group 1
C02 Methane
N20
7
Natural forcings PLUS greenhouse gases emitted by mankind
10
Slide 8
What can influence the
greenhouse effect?
The Sun
Solar cycles
How reflective the Earth is (its albedo)
i.e. how much energy gets absorbed in the first place
The composition of the atmosphere
Greenhouse gases warm the atmosphere (mainly from humans)
We can measure these independently, so make a computer model of
them and see if they agree with observations
Slide 11
8
Can the warming be explained naturally?
Natural forcings =
volcanoes, solar
cycles
Man made forcings =
greenhouse gas
emissions, aerosol
emissions
11
Slide 9
Climate with natural forcings
Source: IPCC AR4, working group 1
Slide 12
But isn‟t it just the sun?
Natural forcings: changes in solar cycle, changes in Earth‟s orbit, volcanoes
9
12
A Training Manual on Use of Climate Information and Vulnerability and Capacity Assessment for
Agricultural Extension Staff in Zimbabwe
Page 107