For a while, the Department of Water and Power in Los Angeles was subsidizing homeowners to replace their lush green lawns with “anything but” replacements. Desert landscapes, artificial turf, rock gardens, etc. We all knew it was to save water in our parched “city in a desert” environment. Made sense. Penalties were assessed against rich estates where the owners did not care about water-over-usage fines. Some cities (e.g., Santa Fe, New Mexico) have banned building swimming pools, and hottest cities in the land – Phoenix and Las Vegas in particular – have put the brakes on building new homes. Sustaining very long periods at temperatures above 110 degrees Fahrenheit suggests that… maybe… perhaps… building massive cities in the middle of scorching deserts might not been a good idea even when these areas were “less hot.” Phoenix is the most populous state capital and the fifth most populous city in the nation. Summer in Phoenix? Who needs a cooktop?
But oddly enough, while water-sucking lawns are hardly appropriate for so many searingly hot cities facing water crises, the reality of growing and maintaining rich grass lawns that are so much fun for kids to play on… well, they are also major contributors to greenhouse emissions. If you try grow a healthy lawn without using any chemicals, the bugs will thank you and you will probably be richly rewarded with massive ugly brown spots that simply defy all attempts to convince grass to grow there. Writing for the July 22nd Los Angeles Times, Diane Lewis, MD and founder of the Great Healthy Yard Project, explains exactly what most yards growers do to make matters so bad:
“If you’re like many Americans, you got it through the use of synthetic weed killers, bug killers and fertilizers. As renewable energy and electric cars are gaining a foothold, oil and gas companies are filling the void by ramping up petrochemical production, and that includes pesticides and fertilizers…. Gardeners and homeowners have to do their part in walking that back.
“Petrochemical production and sales have doubled since 2000, and the market is expected to double again over the next 10 years according to the Global Chemical Outlook published by the United Nations. Derived from hydrocarbons, petrochemicals are the basic ingredient in synthetic pesticides and fertilizers (and plastics, but that’s another op-ed). Their manufacture releases greenhouse gases and toxins into the air, and their use contributes to making agriculture the second-largest source of climate pollution. Pesticides are worse than fertilizer, requiring 10 times more energy to synthesize.
“Obviously, farmers are the major market for fertilizer and pesticide, but according to NASA satellite data, there are actually more lawns than cornfields in the United States. And homeowners use up to 10 times more chemicals per acre than farmers, which means yards and gardens are also a huge contributor to greenhouse gas emissions.
“It gets worse. One of the key impacts of using synthetic pesticides and fertilizers is an increase in nitrous oxide production. The greenhouse gas impact of N2O is 300 times more powerful than carbon dioxide’s. Additionally, nitrous oxide attacks the ozone layer, our key defense against the sun’s ultraviolet rays… Too much fertilizer, which is packed with nitrogen, is a large part of the problem. Crops can only use about half of the nitrogen currently applied to farm fields, and homeowners’ overuse only compounds the situation.
“Advertising presents images of perfect lawns, leading us to believe that more and more fertilizer will turn our yards into landscaping showpieces. The reality is that excess nitrogen just runs off fields, fueling algae blooms and poisoning rivers, streams and lakes and seeping into groundwater. What doesn’t run off stimulates soil microbes to produce much larger amounts of nitrous oxide than they would if left to their own devices. Pesticides aren’t as big a nitrogen culprit as fertilizer, but their use also increases nitrous oxide release — sevenfold.
“Synthetic fertilizers and pesticides are also biocides — meaning they kill bacteria and fungi in the soil, including the good ones that make up the normal, healthy microbiome… In healthy soil, as beneficial bacteria and fungi reproduce, thrive and decay, the process sequesters carbon and naturally feeds the plants. This benefit is removed when the organisms are killed by chemicals. At the same time, when biocides disrupt the soil microbiome, they remove natural protections that defend plants against harmful bugs and bacteria.
“Synthetic pesticides in particular create a vicious cycle that releases more greenhouse gases: Insects and weeds become resistant to the chemicals, growers use more, killing even more beneficial soil organisms and incentivizing more pesticide manufacturing and releasing more greenhouse gases.
“What’s a gardener to do? We can each make huge dents in our greenhouse gas contributions and enjoy beautiful gardens without chemicals. Here are some simple techniques that support soil health without fertilizers and pesticides… First, landscape your home and garden with native plants that are already well-adapted to local conditions. Replacing grass with natives is one of the easiest and most beautiful ways to landscape without chemicals. As a residual benefit, you will see a marked increase in birds, butterflies, bees and other wildlife in your gardens, making them even more alive.
“If you stick with grass, grow less of it and aerate it. Spread grass seed, instead of fertilizer, to keep it lush and to out-compete weeds. Throw away the bag on your electric lawn mower, leaving clippings and leaf mulch on the lawn as compost…. If you stick with grass, grow less of it and aerate it. Spread grass seed, instead of fertilizer, to keep it lush and to out-compete weeds. Throw away the bag on your electric lawn mower, leaving clippings and leaf mulch on the lawn as compost.
“Garden naturally and engulf yourself in the dividends: hummingbirds hovering at your manzanita blossoms. Bees so busy you can watch them up close without danger of being stung. A cedar waxwing with a toyon berry in its mouth. Western bluebirds that do you the favor of eating caterpillars off your tomato plants. A kaleidoscope of butterflies that glide together to sleep in the trees as dusk settles in.”
Lawn wolves, be aware that after a good rain, if you live in an area that actually has good rain, or after your have over-watered your lovely lawn, all those lovely chemicals are in significant part washed into… wherever your regional drains go. Rivers, lakes, aquifers, the oceans, all presumably after being cleaned and scraped of debris and toxins. Sometimes those massive deluges overwhelm water treatment plants. Sometimes those water treatment plants are older than your great grandfather or have not been updated to cover all those marvelous new chemicals. Fish? Plants in those bodies of water? Who cares? If we are killing ourselves, we should take all those nasty life forms with us! Fight global warming with global worming!!!
I’m Peter Dekom, and if you really do care about global warming and the environment, and if you indeed have a lawn that fits the above description, you really can make a difference by doing what really must be done!
Posts
No comments:
Post a Comment