Neymar and kaka are footballers from football

however - это протипоставление вроде

moreover - когда кроме чего то есть еще что то, используется в разговорном стиле

to sum up - используется в объяснении чего либо как заключение

whats more - используется в вопросах сравнения.

если я правильно могу дать перевод если надо

1.a garbage is not only ugly, bute dangerous because it causes an air pollution.

2. cars are an important part of a life for most people. but cars also cause a pollution and release fume.

3. in canada people don't realise that they throw out 10,000 tons of a waste.

4. over 14 billion pounds of a waste per year is throw out to sea and it kills millions of sea animals.

5. if we want to breathe  a healthy air we have to think about what we do.

6. because of our lack of a knowledge there is now a huge hole over an antractic.

7.a water is a vital element of a life.