Why is prime productive NZ farmland disappearing under a sea of Pine trees?

How is it possible that thousands of Hectares of prime productive rural land in NZ is being sold to foreign companies and permanently planted in pine trees - a mono culture that destroys ecosystems and biodiversity acidifies waterways and ruins soil?

The Govt has changed OIC Overseas Investment Commission rules to encourage this and plans to quadruple Carbon Credit prices with the ETS which will escalate this problem.......