Daily Bulletin


News

  • Written by Sebastian Leuzinger, Associate Professor, Auckland University of Technology
Climate explained: why your backyard lawn doesn't help reduce carbon dioxide in the atmosphere CC BY-ND Climate Explained is a collaboration between The Conversation, Stuff and the New Zealand Science Media Centre to answer your questions about climate change. If you have a question you’d like an expert to answer, please send it to climate.change@stuff.co.nz I read somewhere that 1,000 square metres of grass absorbs the same amount of carbon dioxide that one person produces. I then think about my small 10ha property. Does that mean that I am covering 100 peoples’ CO₂ emissions every day? What about those large 1,000ha properties then? Do they absorb thousands of tonnes of carbon every year? In New Zealand, your average carbon footprint will be around four tonnes of carbon, emitted per year (based on the carbon contained in 16.9 tonnes of carbon dioxide equivalent annual per-capita emissions). A 1,000-square-metre area of grass will take up around one tonne of carbon per year. So if you didn’t fly much, lived in a well insulated home, cycled to work etc, you might bring your overall footprint down to around one tonne of carbon per year, the equivalent of what a backyard lawn may take up per year. So far so good. The big problem (causing tremendous confusion even among scientists) begins right here. In the above, we talk about fluxes, not pools. Using your bank account as an analogy, fluxes are transfers, pools are balances. Read more: Climate change is hitting hard across New Zealand, official report finds With your own carbon emissions, regardless whether they are one or four tonnes per year, you pay into the atmosphere’s account every year. This means that there is more and more carbon in the atmosphere. That carbon comes from fossil fuels – an entirely different “account”. Regardless of whether you have 1,000 or 100,000 square metres, this is what grass is doing in this analogy: it takes carbon from the atmosphere every year, but that carbon is going straight back to where it was taken from when you mow the lawn and the biomass is broken down and returned to the atmosphere. In other words, your carbon footprint is a flux that leads to a permanent change in a pool (the atmosphere). This is a bit like a weekly salary. You don’t have to pay it back. What your lawn is doing however, is making payments that are returned a few weeks or months later (when you mow the lawn, a cow eats the grass, or when natural turnover takes place). The bottom line is that short-term fluxes (as large as they might be) don’t matter if they are reciprocated by an equivalent but opposite flux. If you want, let’s do the experiment. You pay $1,000 onto my account ever odd week, and I pay $1,000 onto yours every even week. None of us will care – as little as the atmosphere will worry about the carbon that your grass patch briefly locks away from it. So your grass won’t lock away carbon dioxide from the atmosphere in the long run. Neither will any grassland in New Zealand. Read more: Climate explained: why plants don't simply grow faster with more carbon dioxide in air If you wait long enough, things can become a bit more complicated, namely if my payments back to you start to become a little less or a little more, causing dollars or carbon to accumulate on one account rather than the other. While this is the case in some ecosystems, such as a growing forest, New Zealand grassland is unlikely one of them. So your backyard isn’t helping, there is no way around reducing our greenhouse gas emissions.

Authors: Sebastian Leuzinger, Associate Professor, Auckland University of Technology

Read more http://theconversation.com/climate-explained-why-your-backyard-lawn-doesnt-help-reduce-carbon-dioxide-in-the-atmosphere-122312

Writers Wanted

Behind Victoria's decision to open primary schools to all students: report shows COVID transmission is rare

arrow_forward

As universities face losing 1 in 10 staff, COVID-driven cuts create 4 key risks

arrow_forward

Birthdays, holidays, Christmas without mum or dad: how to support kids with a parent away fighting fires

arrow_forward

The Conversation
INTERWEBS DIGITAL AGENCY

Politics

Did BLM Really Change the US Police Work?

The Black Lives Matter (BLM) movement has proven that the power of the state rests in the hands of the people it governs. Following the death of 46-year-old black American George Floyd in a case of ...

a Guest Writer - avatar a Guest Writer

Scott Morrison: the right man at the right time

Australia is not at war with another nation or ideology in August 2020 but the nation is in conflict. There are serious threats from China and there are many challenges flowing from the pandemic tha...

Greg Rogers - avatar Greg Rogers

Prime Minister National Cabinet Statement

The National Cabinet met today to discuss Australia’s COVID-19 response, the Victoria outbreak, easing restrictions, helping Australians prepare to go back to work in a COVID-safe environment an...

Scott Morrison - avatar Scott Morrison

Business News

What Are The Qualities Of A Good Rubbish Removal Company?

It’s common for residential and commercial properties to have wastes. Families will usually have food wastes, while businesses will have to dispose of toxic wastes regularly. Different wastes ar...

News Company - avatar News Company

5 Ways a Printed Marquee Can Help You Sell More at Markets

If you’re a local business owner, you probably already know that outdoor markets are a great way to reach customers and sell your product. If you already have permanent premises, they allow you ...

News Company - avatar News Company

5 Essential Tools for Working Remotely in 2020

The average, modern office worker spends 8 hours a day, 5 days a week in a company building. Since the start of COVID, however, many of these companies have allowed workers to work from home due...

News Company - avatar News Company



News Company Media Core

Content & Technology Connecting Global Audiences

More Information - Less Opinion