3 ms·The biggest hurdle is the two largest nations on earth not caring about itby dmitrygr 7y agoThe biggest hurdle is the two largest nations on earth not caring about itummonk 7y agoWhich country are you referring to for #2? Canada? Or China?shanxS 7y agoChina and US (in that order) https://www.ucsusa.org/global-warming/science-and-impacts/science/each-countrys-share-of-co2.html https://www.ucsusa.org/global-warming/science-and-impacts/sc...