Activists have climbed onto the roof of Immigration Minister Peter Dutton's office to send a message about climate change and the Great Barrier Reef.

Two protesters unfurled a banner reading "Dump Dutton and the climate action blockers" on Friday as part of a series of organised moves throughout the week.

Protesters hold banners outside Peter Dutton's electorate office in Strathpine. Credit:350.org

They left disappointed not to have been able to enter the Immigration Minister's Dickson electorate office, in Strathpine, north of Brisbane.

Protester Lesley Hughes, from Clear Mountain in the electorate's south, said the 50 or so activists were looking to draw publicity to climate change and its impact on the Great Barrier Reef, which has suffered the greatest bleaching event ever recorded.