OK I will bite, let's convert the USA from plastic bags to paper...

OK I will bite, let's convert the USA from plastic bags to paper bags:

Americans use 100 billion plastic bags a year.

https://www.biologicaldiversity.org/programs/population_and_sustainability/sustainability/plastic_bag_facts.html

To replace these 100 billion plastic bags with paper bags we would need to cut down an extra 140 million trees a year.

https://www.simpleecology.com/eco/paper-or-plastic-shopping-bags

To convert just Americans from plastic bags to paper bags we would save 12 million barrels of oil but sacrifice 140 million trees every year.