Human activities threaten the Earth's ability to sustain future generations.I used to believe that the "hippies" were completely wrong and just plain stupid about the environment.But,in my short 20 years on this planet I have noticed things that make me rethink my position on the environment.The climate of my hometown has changed completely in the last 10 or so years,and I see the brown cloud of pollution over the city far too often.It hardly snows here in the winter anymore,and we are in a severe drought.There is no way that we are not having an effect.Do I believe that the human species is going to come to an end in the near future?No.We will innovate,and adapt using the thing that made us into the dominant species on this planet - our brains.