3- We are polluting the air faster than ever.
This pollution is slowly killing us, killing our children and killing all other creatures on earth.
Although it is possible to improve the air quality in our towns and cities by using electric cars, having pedestrian areas, using bicycles, using public transport, etc, this is not going to reduce the production of carbon dioxide, it is only shifting it from one place to another. The earth atmosphere is warming, a couple degrees may not seem like much but this has already led to climate change and the melting of the ice caps. If we do not reverse this, there would not be much left for future generations.
We have to act now and care more for what we have.