global warming and greenhouse effect

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Global warming and greenhouse effectTopic of the Presentation is

Global Warming Global warming is the rise in the average temperature of Earth's atmosphere.


Observed temperature changes

The Earth's average surface temperature rose by 0.740.18C over the period 19062005. The rate of warming over the last half of that period was almost double

Greenhouse gasesThe greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions.


Naturally occurring amounts of greenhouse gases have a mean warming effect of about 33 C (59F).The major greenhouse gases are Water vapor, which causes about 3670% of the greenhouse effect Carbon dioxide (CO2), which causes 926% Methane (CH4), which causes 49%; and Ozone (O3), which causes 37%.

Observed and expected environmental effects Detection and attribution may also be applied to observed changes in physical, ecological and social systems.

Natural systemsGlobal warming has been detected in a number of natural systems. e.g. sea level rise and widespread decreases in snow and ice extent.

Ecological systemsclimate change is expected to particularly affect certain ecosystems, including tundra, mangroves, and coral reefs. Dissolved CO2 increases ocean acidity.

Observed and expected effects on social systemsFood security- Under present trends, by 2030, decrease by up to 30% while rice, millet and maize in South Asia could decrease by up to 10%.Habitat inundation- Maldives, Tuvalu and homelessness in countries with low lying areas such asBangladesh

Responses to global warmingMitigation : The IPCC defines mitigation as activities that reduce greenhouse gas (GHG) emissions. Many countries, both developing and developed, are aiming to use cleaner, less polluting, technologies.

Energy-related carbon-dioxide (CO2) emissions in 2010 were the highest in history, breaking the prior record set in 2008.

CON Adaptation : A concept related to adaptation is "adaptive capacity," which is the ability of a system (human, natural or managed) to adjust to climate change

ConGeoengineering : Geoengineering, the deliberate modification of the climate, has been investigated as a possible response to global warming, e.g. by NASA and the Royal Society




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