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Environmental (natural) threats include - Flood - Fire - Earthquakes, storms and tornadoes - Excessive Heat - Inadequate Power Supply (People are still the biggest threat, but aren't environmental.)
floods
people
Motor vehicles and hunters are the biggest threats to raccoons.
lighting and bad wind is the biggest treat or tornadoes
habitat destruction, or humans
Humans and human activities, particularly fishing are the biggest threats.
The answer is poaching
Tiger Sharks are their biggest threats
Pollution is a natural threat to coral reefs.
Rabies and mange are the two biggest.
the biggest threats on the coniferous forest are wildfires, clearcut logging, and just plain old taking away the environment/biome.