Today we learn of a feedback loop that is more economic than it is scientific. Increased CO2 levels cause the oceans (the world’s largest carbon sink) to become over saturated with carbonic acid, causing acidification and stratification of seawater until phytoplankton (also an enormous carbon sink – using photosynthesis to take CO2 out of the water) are no longer able to function (and being at the bottom of the food chain, this has direct consequences for all other creatures…).Shrinking forests, like the Amazon, reduce the ability of the forest to water itself through evaporation and precipitation – thus resulting in a rapid drying and an escalating reduction in forest cover, causing forests to transform from carbon sinks into carbon sources – amplifying atmospheric warming, escalating forest drying, and so on….

Increasing levels of CO2 in the atmosphere are causing permafrost in the arctic tundra to melt – releasing enormous quantities of methane (approximately 20x more powerful as a greenhouse gas than CO2), thus escalating the pace of warming, thus releasing more methane, and so on….

If this all sounds a bit confusing, here are few of good examples to illustrate: For the uninitiated, it’s a concise way to describe how the results of an activity cause a change in the activity itself – subsequently amplifying the outcome of the activity, and beginning an increasingly rapid, and potentially runaway, cycle of change. Over the last few years, the term ‘feedback loop’ has become common terminology.

Today we look at another environmental feedback loop, and also put you in the driver’s seat of the world’s biggest fast food chain.

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