The Greens continue their vote chasing strategy of appealing to populist nationalism - most recently in condemning foreign investment in New Zealand. They are seemingly unhappy about foreign businesspeople making profits, when it could be (nicer?) New Zealand businesspeople making the profits.
UPDATE: The foreign investment figure used by the Greens ($16b) appears to hugely exaggerate the level of investment. According to Michael Cullen, this double counts foreign-owned assets sold to other foreign investors, and the figures is more like $4b. The same article points out that the Government has in many ways already tightened the rules on the sale of land to foreigners.