Comparative and superlative adjectives - Modulating comparisons

1.Some materials have a much higher carbon footprint than plastic.

2.Our knowledge is growing even faster. 

3. The electricity would be from far more expensive forms.

4. With ever stronger research since then, the scientific consensus is likely to have risen.

5. US power stations are switching to much cheaper shale gas

6. It has become a lot harder to make money from plastic recycling.

You can modulate the comparison by using:  Much – a lot – far – a bit – a little – slightly …