Disparition des ours polaires correction de texte

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Bonjour

Pourriez-vous me corriger le texte ci-dessous sur une présentation que je dois faire sur la disparition prochaine des ours polaires

DANGER POLAR BEARS ARE EXTINCT
Because of global warming, the Arctic today is increasingly melting its ice, which affects polar bears in their habitat and diet and puts their survival at risk.
Scientists are unanimous if we do not react, polar bears will disappear completely from the earth by the end of the century.
Many associations, such as the WWF Foundation, the media and scientists, are shouting alarms about the risk of polar bears disappearing to make the public aware of it and for everyone to participate in protecting the environment.
Indeed, man is primarily responsible for this situation. In addition to global warming, our industries, agriculture and human activities continually discharge pollutants into the atmosphere, soil and aquatic environments. Thus hundreds of chemicals have been found in the oceans and ice of Antarctica and thus in the body of most polar bears. These toxic materials weaken their immune system and their hormonal system and are therefore less resistant to severe cold, and endangers the breeding of this species.

If everybody, big and small, is acting on his level, there may be a small chance of saving the polar bear. Let us act.

Merci pour votre aide