![]() ![]() 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. Neither will any grassland in New Zealand.Ĭlimate explained: why plants don't simply grow faster with more carbon dioxide in air So your grass won’t lock away carbon dioxide from the atmosphere in the long run. None of us will care – as little as the atmosphere will worry about the carbon that your grass patch briefly locks away from it. You pay $1,000 onto my account ever odd week, and I pay $1,000 onto yours every even week. 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. 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). In other words, your carbon footprint is a flux that leads to a permanent change in a pool (the atmosphere). 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. That carbon comes from fossil fuels – an entirely different “account”. This means that there is more and more carbon in the atmosphere. With your own carbon emissions, regardless whether they are one or four tonnes per year, you pay into the atmosphere’s account every year. Using your bank account as an analogy, fluxes are transfers, pools are balances.Ĭlimate change is hitting hard across New Zealand, official report finds In the above, we talk about fluxes, not pools. The big problem (causing tremendous confusion even among scientists) begins right here. 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. A 1,000-square-metre area of grass will take up around one tonne of carbon per 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). 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? I then think about my small 10ha property. If you have a question you’d like an expert to answer, please send it to read somewhere that 1,000 square metres of grass absorbs the same amount of carbon dioxide that one person produces. Climate Explained is a collaboration between The Conversation, Stuff and the New Zealand Science Media Centre to answer your questions about climate change. ![]()
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