You are left 61,250 dollars or 30,000 pounds in a will what eco friendly product would you spend it on?

Imagine, your Aunt dies and leaves you money in her will equivalent to 30,000 British Pounds. The only clause is that you have to spend it on an environmentally friendly product/service/item or issue. And you MUST SPEND it or it is given to the local cat’s home. What would you buy?