The head teacher of Belton Lane Primary in Grantham announced students would not be allowed to send each other cards, warning the tradition was bad for the environment.
Following requests from a number of students, Jonathan Mason wrote to parents informing them of the move.
Children have instead been encouraged to send just one card, addressed to the entire class in an effort to reduce waste.
Ruth Jarman from environmental charity Green Christian told Premier it's encouraging to see young people taking steps to protect the planet.
"It's a way of telling the truth about the climate and ecological emergency we're in."
Masons' action has prompted backlash from parents who have accused him of "rank hypocrisy" over his "Grinch like" policy.
In his letter to mums and dads, he remarks that the number of Christmas cards sent during the festive season would cover the world's circumference 500 times if placed alongside one another.
Jarman thinks adults need to take greater responsibility to persevere "God's creation" for future generations.
"It's not our world. As adults, we're making decisions that our children will live through," she added.
Jarman went on to say, "we are all hypocrites" when it comes to the environment, because "we cannot live perfect life".
"But I think anything that tells the truth about where we are going and how we should be living is something that has to be done," she added.
Jarman is encouraging Christian's to model actions that are less "excessive" and "damaging" to the earth God gave us.
Stay up to date with the latest news stories from a Christian perspective. Sign up to our daily newsletter and receive more stories like this straight to your inbox every morning.