The head of Brazil's national space agency has been sacked weeks after Brazil President Jair Bolsonaro accused the agency of lying about deforestation reports.

Agency chief Ricardo Galvao said his mandate was terminated early due to an “unsustainable situation” following a meeting with Brazil’s Minister of Science.

The space agency had reported a nearly 90 per cent hike in forest clearing in the Amazon since President Bolsonaro took office, with multiple science organisations backing the data.