Why are pinecones green on a bristlecone pine tree?

Pinecones on a bristlecone pine tree are green primarily due to the presence of chlorophyll, which aids in photosynthesis. This green coloration indicates that the cones are still developing and have not yet matured. As they mature, the cones typically change color, often turning brown, as they prepare to release seeds. The green cones help the tree efficiently utilize sunlight during their growth phase.