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As crews re-string electric lines and clear debris from Hurricane Maria, a small group of Puerto Rican and international conservationists is working on rebuilding natural wonders destroyed by the strongest storm to hit the island in nearly a century.

Environmental groups and volunteers are gathering native seeds to replant forests across the U.S. territory and grafting broken coral back onto shattered reefs to help repair damage in the largest-ever effort of its kind for Puerto Rico.

The Category 4 storm damaged 1.2 billion trees and snapped hundreds of thousands of corals off reefs around the island when it hit on Sept. 20.

Helping nature recover has environmental and economic importance: Puerto Rico's natural beauty is one of its biggest tourist draws.