bio

Transpiration

The loss of water from a plant through tiny pores in its leaves as water evaporates into the air. This evaporative pull is the engine that drags the whole water column up the tree — but it is also the cost: a plant opens its pores to take in CO₂ for food and bleeds water in the process. In a CO₂-rich atmosphere like Pandora's, a tree can feed fully while barely cracking its pores open, spending almost no water — part of why Pandoran trees can grow so tall.