Environmental groups warn Adani's Carmichael mine and the governments that support it face widespread and growing protests across the country after the company secured final approval for the Galilee Basin coal project.

In a taste of what's to come, about 200 protesters gathered on Saturday outside the Indian High Commission in Canberra, with several dozen campaigning near the Indian consulate in Sydney. The target was not only the Carmichael mine but the Indian company's destruction of Hasdeo Arand tribal land forests in its home nation.

Anti-Adani protesters gathered Saturday outside the Indian High Commission in Canberra, with a smaller group also staging an event at the country's consulate in Sydney. Credit:Bob Brown Foundation

"We're just gearing up," Bob Brown, the former Greens leader, told The Sun-Herald and the Sunday Age. The company and governments are "going to be surprised by the variety and vigour of the protests".

The Morrison government hailed this week's final environment approval being granted by the Queensland Labor government, saying the $2 billion Carmichael mine would open the first new coal province in Australia in half a century.