Make it law that all companies should be Carbon Neutral

This would be a fair system as small companies are likely to have a limited impact on Climate Change and so would have a small fee. Larger companies are likely to have a much larger impact and so would pay accordingly. And large companies making changes and limiting their impact would be rewarded by paying smaller fees.

There are several different Carbon Offsetting / Neutral schemes available. The government should authorise a range so a choice is allowed.