$100k on lobbying over reef danger list

Federal government officials have spent more than $100,000 on travel costs lobbying other countries not to put the Great Barrier Reef on UNESCO'S world heritage in-danger list.

The world heritage committee will make a decision in late June.

Environment department officials have so far visited 19 out of 21 countries that are committee members, a Senate estimates hearing in Canberra was told on Monday.

Greens deputy leader Larissa Waters said if the federal government was serious about protecting the reef it would revoke approval for the world's largest coal port at Abbot Point, and introduce credible climate action policies.

"What the reef needs right now is action, not overseas lobbying trips," she said in a statement.