reference to the total greenhouse gases
emitted by someone / something
most often measured
in tons of CO2
reduced carbon footprint =
reduction in your negative
impact on the environment
there are both direct and indirekt
forms of carbon emissions
direct
driving your car
indirect
using electricity inside
your home (electricity is
created somewhere else)
Explanation
The Earth's climate is driven by a continous
flow of energy from the sun. Energy in the
form of heat passes through the Earth's
atmosphere and warms the Earth's surface.
Some of this heat is absorbed by
gases in the atmosphere, such as
Carbon dioxide (CO2) and methane
As the temperature increases, the Earth
sends heat energy (infrared radiation)
back into the atmosphere
Greenhouse
effect
Gases act as a blanket, trapping in the heat and preventing it
from being reflected too far from the Earth. They keep the
Earth's average temperature at about 15°C.
15°C = warm enough to sustain life
for humans, plants, animals
Without these gases: average temperature ~
-18°C >> too cold for most forms of life
Is a natural warming effect
Global Impact
some regions and seasons will
become wetter, others drier
summer droughts become more intense
Trocial cyclones become more severe
cold weather: less frequent
Changes in
atmosphere
Human activities have increased
greenhouse gases
throws the climate
system out of balance
rising levels of carbon
dioxide >> likely to double
by end of this century
carbon dioxide = responsible for
60% of greenhouse warming
Geographical changes
Glaciers melt
Arctic sea-ice
becomes thinner
global sea levels rise
vegetation zones will
change and boundaries
between the zones will shift
human and animal
diseases spread
e.g. Malaria
tropical / sub-tropical areas:
rising risk of famines
food production
becomes harder
natural disasters
flooding
forest fires
heat waves
storms / hurricanes
food / water shortage
diseases
counter-measures
carbon emission limits / cuts
development of alternative technologies
forms of renewable energy
changes in lifestyle
Global
Warming
an increase in the earth's average atmospheric temperature
that causes corresponding changes in climate and that may
result from the greenhouse effect.