Investigating the Existence of Global Warming Essay

Investigating the Existence of Global Warming Essay

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Investigating the Existence of Global Warming

Evidence For:

Evidence Against:

· Methane Increasing

Levels of atmospheric methane, a powerful greenhouse gas, have risen
145% in the last 100 years. Methane is derived from sources such as
rice paddies, bovine flatulence, bacteria in bogs and fossil fuel
production.

· Peculiar Weather

Recently, young people in Vietnam noticed strange white stuff covering
the fields. They had never seen snow before. It is the coldest spell
in the country for 20 years.

· Carbon Dioxide Increasing in Atmosphere

The atmospheric levels of the greenhouse gas carbon dioxide, have
increased since pre-industrial times from 280 part per million (ppm)
to 360 ppm, a 30% increase. Carbon dioxide concentrations in the
atmosphere are the highest in 160,000 years. Carbon dioxide is a
by-product of the burning of fossil fuels, such as gasoline in an
automobile or coal in a power plant generating electricity.

· Cooling Poles

Recently, scientists found that temperatures in the Arctic have been
cooling since the 1920s. Computer predictions are that, if the world
is warming, the Poles should warm twice as much.

· Disappearing Glaciers

Ice is melting all over the planet. Glaciers are melting on six
continents. If present warming trends continue, all glaciers in
Glacier National Park could be gone by 2030. The park's Grinnell
Glacier is already 90% gone.

- Ice cores taken from the Dunde Ice Cap in the Qilian Mountains on
the north- eastern margin of the Qinghai-Tibetan Plateau indicate that
the years since 1938 have been the warmest in the last 12,000 years.

- The melting ...


... middle of paper ...


...res almost reached the
capital.

· Animal Behaviour

Many butterflies and birds are moving to the colder north to escape
rising temperatures. The golden toad in Costa Rica has become extinct
because its habitat got too warm.

· Melting Arctic Sea Ice

The Arctic, with an area about the size of the United States, is
seeing average temperatures similar to the Antarctic, almost 5 degrees
Fahrenheit warmer than the planet as a whole.

· Early Starters

Flowers are blooming, frogs are mating, and birds are migrating – 2.3
days earlier on average each decade. These changes are what you would
expect if spring temperatures were rising.

African Floods

In March 2000, Mozambique's floods caused 180,000 people to flee. Many
died. Warmer temperatures cause more evaporation, and result in
heavier rains.

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