Film director James Cameron said he may film part of the sequel to Avatar in the Amazon rainforest.

Cameron told reporters he did not know when he would return to film in the Amazon, parts of which he toured after attending last week's international sustainability forum in the Brazilian city of Manaus.

He also said he would write a letter to President Luiz Inacio Lula da Silva asking that the construction of a huge dam on a tributary of the Amazon River be reconsidered because of its negative impact on the environment.

Environmentalists opposed to the dam say it will devastate wildlife and the livelihoods of 40,000 people in the area to be flooded.

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