"Fires are set at the beginning of the wet when green is just starting to appear where controlled burns are a big effort in Australia.  They use helicopters that drop incendiary pellets or men with drip lines. A huge number of volunteers to make this happen.  The crew we were with talked about how they wanted to napalm a river from a helicopter to burn out the bamboo for flood control... But then the ""greenies"" got involved."
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