Слайд #4
Environment problems
One of the problem is acid rain with disastrous effects. This problem is formed of acid gas, because factories and cars throw out this in the air. What can we do? In my opinion, factories must be with filters, to made oxygen from the dioxide, also cars must be with filters, too. Jet planes produce condensation trails. During night-time, they can heat our planet dozens of times more than the carbon dioxide produced by the same flight at daytime. During daytime, contrails have a slight cooling impact. Avoid fling at night or late in the evening.