National MP Nikki Kaye has criticised Government plans to open Great Barrier Island to mining, as have mayors John Banks and Len Brown.

Business leaders have urged Kiwis to take a rational approach to the debate over the Government's proposed plans to open conservation land up to mining.

The Government is proposing to open up more than 7000 hectares of conservation land for mining on Coromandel, and Paparoa National Park on the West Coast.

Petrol hikes which lifted prices to their highest level in 18 months today have sparked concern from the AA and politicians.

The Government is defending its $347m home insulation scheme against criticism its 'one size fits all' approach is inadequate.