这句话中的recycling.to making ,为什么to面用ing形式,这个to是介词吗?

这句话中的recycling.to making ,为什么to面用ing形式,这个to是介词吗?
There are a number of bestselling downshifting self-help books for people who want to simplify their lives; there are newsletters,such as The Tightwad Gazette,that give hundreds of thousands of Americans useful tips on anything from recycling their cling-film to making their own soap; there are even support groups for those who want to achieve the mid-'90s equivalent of dropping out.