The case for local action against climate change in the wake of the global Paris Agreement could not have been made clearer than it was in a recent New Zealand Herald editorial. It argued "climate goals must now flow into daily life" and concluded "we need reasonable, practical, achievable things to do that would make a difference".
That now is indeed the challenge for Auckland. I am absolutely determined to tackle it head on for a very simple reason: when it comes to climate change, cities are where it's at. Cities have the tools and opportunities to make a practical difference to our shared climate future.
Cities will be the first responders because they know what is at stake. City action could make up a third of the shortfall between the Paris Agreement's ambitions and current country commitments - that's 3.7 gigatons of urban greenhouse gas emissions by 2030.
Like many other global cities, Auckland is facing significant growth pressures, placing high demands on our housing, transport, amenities and the environment. Climate change will magnify these challenges and make it much harder for our citizens to prosper.
As a united Auckland, we have an unprecedented opportunity to respond rapidly and strategically to affect the kinds of changes needed to ensure this city's future. We have set a target of reducing our greenhouse gas emissions by 40 per cent by the year 2040 (relative to 1990 levels).
Through smart planning and development, we can reduce our emissions and deliver a host of other benefits for community health, mobility, affordability and the environment. Working with communities, we can get practical and achievable solutions for Auckland's climate future.
Our just-announced membership of the C40 Cities Climate Leadership Group is significant recognition of our ambition and potential as one of the world's most liveable cities. We will join more than 80 leading cities around the world, finding and implementing innovative solutions to the common climate challenges we face.
Auckland is already taking some steps which now require more focus. We are transforming Auckland's transport system, investing $20 billion over 10 years to create a modern, efficient and sustainable multi-modal public transport system. Public transport patronage is growing at around 10 per cent a year, and rail patronage more than 20 per cent year on year. The introduction of electric trains reduced emissions by 1 per cent and light rail and the City Rail Link will also have a positive impact on emissions.
We are investing in walking and cycling, adding 52km of new cycleways in the next three years - the magenta highway was just the beginning. With 35 per cent of our regional emissions coming from road transport, every car we take off the road counts.
Auckland Council is leading by example with procurement and building and infrastructure design. The retrofit of the council headquarters has reduced energy consumption by 40 per cent and saved more than $500,000 a year. All other council buildings must follow. And we are moving to a Zero Waste City - rolling out separate organic waste collection and a community-led resource recovery network.
Auckland is definitely working in all the important spaces - buildings, transport, energy and waste management. Now we need to pick up the pace. As part of the C40 network, we can engage with cities facing similar challenges, enhancing Auckland's ability to benefit from their expertise, tools and programmes.
C40 research suggests the choices we make in the next five years will determine our climate future - a low carbon trajectory that keeps us at or below 2C or a high one that puts us at serious risk.
The Paris Agreement is a landmark. Now the real work begins, and much of it needs to happen locally. We need to tackle these issues head on.
As Paris Mayor Anne Hidalgo said - it is important to be as concrete as the dangers that threaten us. Auckland - we are on to it.
• Len Brown, Mayor of Auckland, attended the Paris conference on climate change.