What is climate change?
Our planet’s atmosphere is made up of oxygen, nitrogen, and a small percentage of greenhouse gases (GHGs), like carbon dioxide and methane. GHGs work to trap warmth from the sun. Without them, too much heat would escape, and the surface of the planet would freeze. However, increasing the concentration of GHGs in the atmosphere causes the Earth to heat more and the climate to change.
Earth’s climate has changed throughout history, but now the planet is experiencing a warming trend that is a result of our human activity since the mid-20th century (anthropogenic causes). The warming trend is happening faster than has been seen in recent history. This is what we call climate change.
Climate change represents one of the greatest risks to our communities, biodiversity, economy and the life-supporting capacity of our planet. The effects of climate change are being felt across the country. Here in Te Tai Tokerau, Northland and in Kaipara District our communities are already experiencing real changes. The future physical impacts of climate change are likely to be significant and wide-ranging, and will affect our diverse communities, industries and natural environments differently.
What does climate change mean for Kaipara?
- Increase in temperature of 0.5-1.5°C by 2040, and 1.0-3.5°C by 2090
- Increase in number of hot days and heatwave days by 60-80 days by 2090. Increase in number of dry days through the district. Drought potential is projected to increase.
- 16-22 fewer wet days by 2090.
- Slight variations in annual rainfall changes (around 2%), with increases projected in Autumn and decreases for Winter and Spring.
- Increase in severity of rainfall events (more intense short duration rainfall events). By 2090, the depth of a current 1 in 100-year, 1-hour duration rainfall event is projected to increase by approximately 35%.
Sea Level Rise
The average sea level (mean sea level) comes from observations between 1986-2005.
Mean sea levels will very likely rise at a faster rate than previously observed.
- 0.3m SLR by 2045
- 0.9m SLR by 2090
- 1.5m SLR by 2130
Projected impacts summary
- Increased risk of river flooding
- Increased risk of drought
- Increased risk extreme winds
- Increased risk of landslides and soil erosion
- Increased risk of marine heatwaves & pH and nutrient changes in marine waters
- Increased risk of coastal flooding and inundation and coastal erosion
- Increased risk of groundwater salinisation and reduced drainage capacity
Climate change mitigation and adaptation
Climate change work is generally broken down into mitigation actions and adaptation actions.
Mitigation action is any human intervention that reduces the sources of greenhouse gases [GHGs] or enhance the sinks of GHGs. New Zealand has signed the Paris Declaration and passed the Climate Change Response Amendment Act 2019 [Zero Carbon Bill] that commits the country to net zero emissions [except biogenic methane] by 2050.
Adaptation action is grounded in evidence that, regardless of what happens with emissions today and in the future, we are locked into 1.5°C warming and connected changes. This is due to our past global emissions. Through adaptation, we seek to moderate or avoid harm or make the most of beneficial opportunities.
The ways the projected changes and increased natural hazard risks will affect our communities and our livelihoods will depend on when and how we decide to adapt and mitigate further emissions.
What are we doing about climate change?
In 2017, Council signed New Zealand Local Government Leaders' Climate Change Declaration. This declaration commits Kaipara District Council to climate change action.
Council is currently reviewing its two main tools for planning and strategy, the District Plan and the Long Term Plan. As a part of this review, Council is laying the groundwork for a unified climate change strategy, which includes mitigation and adaptation action plans.
As climate change strategy and action plans develop, Council is committed to working collaboratively our Mana Whenua partners, Te Roroa and Te Uri o Hau. This includes support of Te Ao Māori approach to climate change adaptation and mitigation. Council is also committed to working key stakeholders, engaging with communities, and upholding rangatahi voices.
Additional completed and ongoing initiatives are described below.
- Council is in the process of a GHG emissions inventory and will publish a Corporate and District GHG Footprint this year. We aim to begin annual reporting on our emissions in 2020.
- We have increased energy efficiencies and reduced energy consumption through LED lights projects and solar speed signs.
- We have a Waste Minimisation Plan and are reviewing an updated Waste Minimisation Plan.
Council is a participating member in Climate Adaptation Te Taitokerau (CATT) joint council collaboration.
- CATT is in the process of conducting a Risk Assessment and forming a Te Taitokerau Adaptation Strategy.
- In collaboration with NRC, Council is currently updating and expanding natural hazards mapping and modelling for Kaipara District.
What can I do about climate change?
Find out your footprint and reduce your emissions
Learn where your greenhouse gas emissions are coming from
Global Footprint Network
Ekos Lifestyle Calculator
The Ministry for the Environment recently released a guide to help New Zealand businesses offset their emissions properly