2. Water Pollution
Water pollution is the
contamination of water bodies
(e.g. lakes, rivers, oceans, aquifers
and groundwater). Water
pollution occurs when pollutants
are directly or indirectly
discharged into water bodies
without adequate treatment to
remove harmful compounds.
Water pollution affects plants and
organisms living in these bodies of
water. In almost all cases the
effect is damaging not only to
individual species and
populations, but also to the
natural biological communities.
3. Air Pollution
Air pollution is the
introduction into the atmosphere
of chemicals, particulates, or
biological materials that cause
discomfort, disease, or death to
humans, damage other living
organisms such as food crops, or
damage the natural environment
or built environment.
The atmosphere is a
complex dynamic natural gaseous
system that is essential to support
life on planet Earth.
Stratospheric ozone depletion
due to air pollution has long been
recognized as a threat to human
health as well as to the Earth's
ecosystems.
4. Points to stop air & water pollution
AIR POLLUTION
• Utilise the public
transport system or
reduce your amount of
driving time to lessen
air pollution.
• Plant more trees &
plants to increase the
amount of co2 output
into atmosphere.
WATER POLLUTION
• Avoid giving bath to
animals in the lakes or
river.
• Avoid keeping the
release vents of factory
wastes into the lake,
river or pond etc.
6. Global warming
Global Warming is the rise in the
average temperature of Earth's
atmosphere and oceans.
Earth surface's mean temperature has
increased by about 0.8 °C (1.4 °F), with
about two-thirds of the increase
occurring since 1980. Warming of the
climate system is unequivocal, and
scientists are more than 90% certain
that it is primarily caused by increasing
concentrations of greenhouse gases
produced by human activities such as
the burning of fossilfuels and
deforestations. These findings are
recognized by the national science
academies of all major industrialized
nations
8. Green House Effect
The 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. Since
part of this re-radiation is back
towards the surface and the lower
atmosphere, it results in an
elevation of the average surface
temperature above what it would
be in the absence of the gases
Solar radiation at the frequencies of visible light largely passes through the
atmosphere to warm the planetary surface, which then emits this energy at the lower
frequencies of infrared thermal radiation. Infrared radiation is absorbed by greenhouse
gases, which in turn re-radiate much of the energy to the surface and lower atmosphere.
The mechanism is named after the effect of solar radiation passing through glass and
warming a greenhouse, but the way it retains heat is fundamentally different as a
greenhouse works by reducing airflow, isolating the warm air inside the structure so that
heat is not lost by convection. ARON (VIII B)
