1. about % of the sun's energy reaches "earth system" must be reradiated to maintain the energy balance or radiative equilibrium
a. 10
b. 30
c. 70
d. 100
2) if it is a cloudy night in winter, the air is likely to be due to clouds reradiating infrared heat back to surface.
a. cooler
b. warmer
c. same
3) which atmospheric forcing agent has made the most positive change in the global radiative forcing over the last 250 years?
a. o3
b. ch4
c. n2o
d. co2
e. sun
4) the negative radiative forcing agents from land use change, aersols etc. balance the positive forcing from greenhouse gases.
a. true
b. false
5) which atmospheric gases absorb and reradiate infrared radiation.
a. co2 and n2o
b. n2 and co2
c. o2 and n2o
d. n2 and o2
6) which country is emitting the majority of the 40 billion tons of annual (2014) greenhouse gases?
a. european union
b. india
c. russia
d. united states.
e, china
7) what is a good estimate of the global temperature change since the late 1800s?
a. -1 °c
b. 1.0 °c
c. 0.5 °c
d. 0.1 °c
8) which region has experienced the greatest warming as earth tempearture have risen from 1800s?
a. antarctica
b. tropics
c. arctic
d. mid-latitudes
9. for evert 1 c temperature increase in the air, water vapour increases %.
a. 1
b. 10
c. 25
d. 7
10) increasing moisture in the atmosphere is considered a climate change.
a. principla driver
b. negative weakning feedback
c. positive reinforcing feedback