Therefore, to complete the virtuous circle of forestry, this Government has introduced the billion trees kaupapa, dedicating nigh on $500 million over a period of time to achieve the outcome of having planted one billion trees, for a host of purposes. Purpose number one is to expand the size of the nation's lung and to provide us with an option to manage the transitional costs of climate change. Purpose number two is to invest in biodiversity by ensuring that the trees that are planted under our Government's programmes are a mix of exotic and native, and that such activities generate positive outcomes in terms of sustainability.