The Australian Greens say infrastructure, broadband and constitutional reform must be on the agenda today, when the first Mayors' Summit kicks off in Canberra.

"Today's summit presents a rare opportunity to develop a shared response to the environmental challenges we face," said the Greens Spokesperson for Local Government, Senator Scott Ludlam.

The Australian Greens today outlined their vision for Australia in the new century ahead of the opening of the Balance-of-Power Senate.

Australian Greens Leader, Senator Bob Brown, said a record 1.17 million people voted Greens at the last election, and the five Greens Senators were ready to work constructively with all parties to respond to the challenges of the new century.

"Pollution, poverty, discrimination and the destruction of Australia's forests and precious environments are the legacy of the last century and decades of greed and inaction."