Climate change is inevitable. It has, and usually will be, a feature of our planet. Why then are we so worried about it? We be concerned due to the fact in our modern world of increasing human numbers and affluence, rapid climate adjust affects us directly.
Changes to rainfall, temperature, frequency and intensity of severe climate, shifts in seasonality, and other locally substantial effects, such as seal level rise and melting glaciers, are the obvious consequences of climate change. These effects compromise meals safety, our water supplies, economic stability, and in intense scenarios threaten lives.
Somewhere in our subconscious we are also aware that climate alter effects are a lot more acute than they made use of to be.
A world containing 7 billion men and women who with the help of their immediate ancestors, have modified just about every corner, is not as buffered as it was.
More than time we have modified the environment to feed, clothe and shelter the generations. We have reduce down trees, ploughed fields, diverted rivers and reared livestock. The potential to make such modifications, and the responsiveness of the environment to the modifications we have created, is why there are so lots of of us.
These modifications to habitats have compromised environmental functionality.
Recall that lots of a conservation scientist has warned of the dangers of biodiversity loss. They say that loss of diversity suggests fewer selections for adaptation and delivery of ecosystem solutions. Where habitats are changed biodiversity is lost and nature is not as robust and resilient as she employed to be.
Look at a forest cleared for a wheat crop.
Wheat is an annual grass that dies back when the seed heads have matured, so element of the year there is only straw stubble in the field. Typically farmers will plough in or even burn this stubble to leave the soil bare for quite a few months. Exposed soil loses moisture, carbon and its biological activity. Dry, exposed soil is vulnerable to the wind and is readily eroded below heavy rain. Every year the grain crop feeds us only over time soil structure, moisture retention and biological activity decline. Unless we apply fertilizer and insecticides yields decline too.
This bare soil and single species crop technique that becomes dependent on inputs is not resilient to climate alter. Warmer and drier or colder and wetter, extreme events and changed seasonality all have an effect on productivity.
The original forest is effectively buffered against these effects. Trees are long-lived with deep root systems. Tree canopies and a layer if leaf mulch protects the soil surface to enable retain moisture and maintain biological activity in the soil. Shifts on climate have small general impact.
Sadly it is not possible to make bread from trees.
While floods and drought provide the sound bites and photo possibilities for climate alter, intuitively we know that the modified landscapes that provide us with food and water are vulnerable to climate shifts. It is a worry. Not surprisingly we expect our leaders to implement policies some action to alleviate our concerns.
Humans are an action orientated species. We want to see one thing carried out.
The crux of the vexing debate more than climate modify policy is that one thing can be completed about these modifications to the climate. Alternatively, nothing can or wants to be completed, depending on your point of view.
It also assumes that policy will not only generate that ‘something’ but that what is accomplished will eventually repair the issue.
It may be worth a moment away from rhetoric and spin to consider these assumptions when once more.
The current policy debate is about greenhouse gas emissions. The premise is that human activities in the final 200 years in clearing land for agriculture and livestock, and in burning fossil fuels for power and transport have triggered warming through an enhance in the concentration of greenhouse gases in the atmosphere.
This we know, just about to the point of dogma. We also know that decreasing emissions is the chosen policy option.
And so the political debate has become how to lessen emissions. What policies will slow energy consumption and the emission intensive activities without damaging economic activity? Is it a direct tax on emissions, a industry trading scheme for emission credits, subsidies for alternative energy generation, regulation to limit emissions from autos, or combinations of a host of other options that are obtainable.
The debate has seldom covered the consequences of climate transform. It has focused on action being taken that will fix the challenge – actions to cease climate alter.
www.carbonclick.com will applaud actions to shift from fossil fuel dependence. Having said that, they will be entirely confused by such a single focus. “Why,” they will say, “was so tiny completed to change land management when the consequences of climate modify for food production and water supplies have been so clear.”
No Comments