Anything that promotes skin cancer causes death.
Whatever preserves the ozone layer prevents the release of CFCs.
Nothing that resists skin cancer increases UV radiation.
Anything that destroys the ozone layer increases UV radiation.
There are packaging materials that release CFCs.
Nothing that causes death should be legal.
Some packaging materials should be illegal.

The following sorites are valid. Rewrite each sorites in standard form, using letters to represent the terms and reducing the number of terms whenever necessary. Then use Venn diagrams or the rules method to prove each one valid.