Updated: Apr 12
Most people are now aware that climate change is a serious problem requiring urgent action. But not many kiwis realize just how important forestry will be in our efforts to reach net-zero emissions in Aotearoa New Zealand.
Right now the government is preparing to make some big decisions about what kinds of trees and forests will be eligible to receive carbon credits in the Emissions Trading Scheme. The outcome of this debate will have a profound effect on the time and cost required to meet our climate change targets.
We have created a web tool that allows you to experiment with different land-use options to see if you can set a plan for NZ to reach net zero. You can adjust the amount of additional land allocated to different forestry options to decide which mix results in the best outcome for New Zealand.
The forestry options at your disposal are:
Production forestry (mainly pine trees grown and harvested for logs and timber)
Permanent exotic forestry (trees grown for carbon storage) - the government is considering banning this option.
Native species planting (for carbon storage or wood production)
Native regeneration (bare land allowed to revert back to native bush).
Why does this matter?
New Zealand has been slow to commit to emissions reductions. According to Climate Action Tracker [ref], we are one of the worst countries in the world in terms of our climate targets and progress at decarbonizing. If we are to have any chance of reaching Net-Zero emissions by 2050, it’s going to be because trees help us get there.
Emission reductions at source are, of course, critical. We all need to take action as individuals, businesses, councils and as a nation to reduce our emissions. But even with serious year on year reductions, we are still going to need trees to take some of the burden by removing CO2 from the atmosphere.
Trees are one of the best CO2 removal options available, and bring a wealth of other benefits including biodiversity, erosion control, soil improvement and water filtering. And some trees are far better than others at removing carbon from the atmosphere.
Exotic trees like pine, redwood and eucalyptus (amongst many others) grow quickly and can live for a long time, sucking up carbon and storing it for hundreds of years if we let them. They are cheap to establish and could become a source of export income in future as the planet races to decarbonise.
Native forests are best for increasing biodiversity. They also store carbon too, but at a much slower rate than exotic species. They are also more expensive to plant and look after as they take longer to grow and get established.
Many conservationists believe the best solution is to not plant trees at all, but to just leave nature to do its thing. But this requires a long time horizon, does not always result in a rich forest, and is surprisingly expensive due to the requirement for ongoing and effective management of browsing pests such as deer, goats, pigs and possums.
Getting us to Net-Zero is going to require a lot of tree planting and a mix of solutions. But right now, our government is proposing that we remove one of those solutions from our toolbox:
Permanent forests using exotic species.
In order to keep the price of carbon high, thereby incentivising our biggest emitters to decarbonise, and to avoid a ‘green rush’ turning large amounts of farming land into pine plantations, the government is proposing to remove the option of registering an exotic forest as a permanent one in the ETS.
This means that you can plant pine and other exotic species for production forestry (where you chop them all down after 25-40 years) but if you leave them in the ground, you won’t be able to claim carbon credits from the pollution they remove from the atmosphere.
The challenge is, this move will potentially jeopardise our ability to reach Net-Zero as a nation by 2050. If we can’t reach net-zero in time, we are going to need to buy carbon credits from other countries to offset our emissions. This is likely to cost the country hundreds of millions of dollars, every year.
We believe New Zealand can do much better, by taking a more balanced and pragmatic approach to forestry and land-use, based on the right-tree-right-place principle. What do you think?