Think about it. Christmas cards — they’re probably made in China, where a low-paid, possibly exploited, Chinese workforce slaves away in factories, where machines powered by coal-fired power stations create cards for Western consumers like you and me.
The cards are then shipped to the Western world, in ships that create 2.5% of the world’s greenhouse gasses, before being delivered by dirty old lorries belching out fumes, to warehouses, and then shops. Just think of all those stinky diesel fumes delivering your cards!