Question

The government wants to set new regulations that prohibit chlorofluorocarbons (CFCs) use in aerosol sprays and refrigerants. How will this act help with the sustainability of our environment?

It will increase the costs of aerosol sprays and refrigerants.
It will increase ultraviolet light needed for vegetation.
It will slow the degradation of the ozone layer.
It will decrease the use of fossil fuels.

Answer 1

Well CFC's when they reach the upper atmosphere (statosphere) they are broken down by UV light and release chlorine atoms, these chlorine atoms catalyze the breakdown of ozone - thereby harming our ozone layer.

Which answer do you think it is? :)

Answer 2

If water vapor continued to increase in our atmosphere, what changes would you expect in freshwater lakes?
Answer
Lake temperatures will increase, but dissolved oxygen in the water will decrease.

Water vapor is a potent greenhouse gas, so global temperatures would increase, including lake temperature. Additionally, increased water vapor in the air will reduce the amount that can evaporate from the lake, and further reduce the amount it can cool... which makes the water warmer still. Water temperature increases mean decreased solubility of gases (above 4°C), so dissolved oxygen would tend to decrease on a ppm basis.

Why don't you give us your best guesses at these, and we can help where you've got them wrong.