Til aspektlari amaliyoti

Acivity 1. Working on the vocabulary in bold types. 
Polar Bear 

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In spring 2008, the polar bear was placed on the 
endangered species
list. According to 
the USA's Endangered Species Act, an endangered species is an animal, plant or any other kind 
of wildlife that is likely to face 
extinction
in its natural 
habitat
. Polar bears had already been 
categorized as a "threatened" species which the ESA defines as one that is likely to become 
"endangered" in the foreseeable future. 
The polar bear is the first animal that has been classified as endangered due primarily to 
global 
warming
. Global warming is a form of climate change caused by increased levels of carbon 
dioxide and other 
greenhouse gases
that become trapped in the atmosphere. Oil and gas heaters, 
engines using oil or petrol (or gasoline) and coal-powered electricity plants all require 
fossil 
fuels
that lead to global warming. Renewable energy sources or 
renewables
that don't cause 
global warming include solar, wind and hydro-electricity power. These alternative forms of 
power, as well as the science of climate change, have been strongly attacked by many of the 
world's biggest companies in order to protect the huge profits they make from fossil fuels. They 
do this even though they're fully aware of how much fossil fuels are damaging our planet and 
endangering many of the species we share it with. 
The polar bear's habitat is more 
vulnerable
to global warming than many other species. Polar 
bears live mainly on the sea ice in the Arctic. This is where they hunt for fish and build up fat 
reserves. When the ice melts many polar bears move to land and live off their stored fat. In the 
Arctic, global warming is causing the ice to melt slightly earlier and form slightly later. This 
results in a shorter feeding season for the polar bear. Some 
risk
their lives to find ice. If they 
have to swim too far they will drown from exhaustion and hunger. The World Wildlife Fund 
estimates that over 25% of Arctic sea ice has disappeared in the past 30 years. 
It is not only the polar bear that is at risk in the Arctic. Every species of plant, animal, and insect 
there is threatened by global warming. Nevertheless, groups of concerned scientists 
and