Do you think that global warming can be really stopped?

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I an really worried about this global warming effect that seems to get worse, I read many articles about this and everyone says that if this is not stopped we are going to be a planet close to extintion, some effects might be irreversible like increasing water level, deforestation, worse tornados affectingthe caribbean and southern USA, snow dissapeating from high mountains . I think that if this is not correctednow, later would be very difficult to do and damage would be done to the whole planet, but I am not optimistic that the american goverment in particular would do much about this ´cause these big transnational companies are not willing to help and stop making a lot of bucks contaminating everything Are you optimistic about these situation or not so much like me?