Which Trees Offset Global Warming Best?

Trees are important tools in the fight to stave off global warming, because they absorb and store the key greenhouse gas emitted by our cars and power plants, carbon dioxide (CO2), before it has a chance to reach the upper atmosphere where it can help trap heat around the Earth’s surface.

All Plants Absorb Carbon Dioxide, but Trees are Best

While all living plant matter absorbs CO2 as part of photosynthesis, trees process significantly more than smaller plants due to their large size and extensive root structures. In essence, trees, as kings of the plant world, have much more “woody biomass” to store CO2 than smaller plants, and as a result are considered nature’s most efficient “carbon sinks.”
According to the U.S. Department of Energy (DOE), tree species that grow quickly and live long are ideal carbon sinks. Unfortunately, these two attributes are usually mutually exclusive. Given the choice, foresters interested in maximizing the absorption and storage of CO2 (known as “carbon sequestration”) usually favor younger trees that grow more quickly than their older cohorts. However, slower growing trees can store much more carbon over their significantly longer lives.

Plant the Right Tree for the Right Location

Scientists are busy studying the carbon sequestration potential of different types of trees in various parts of the U.S., including Eucalyptus in Hawaii, loblolly pine in the Southeast, bottomland hardwoods in Mississippi, and poplars in the Great Lakes.
“There are literally dozens of tree species that could be planted depending upon location, climate and soils,” says Stan Wullschleger, a researcher at Tennessee’s Oak Ridge National Laboratory who specializes in the physiological response of plants to global climate change.

Choose Low-Maintenance Trees to Maximize Carbon Absorption

Dave Nowak, a researcher at the U.S. Forest Service’s Northern Research Station in Syracuse, New York has studied the use of trees for carbon sequestration in urban settings across the United States. A 2002 study he co-authored lists the Common Horse-chestnut, Black Walnut, American Sweetgum, Ponderosa Pine, Red Pine, White Pine, London Plane, Hispaniolan Pine, Douglas Fir, Scarlet Oak, Red Oak, Virginia Live Oak and Bald Cypress as examples of trees especially good at absorbing and storing CO2. Nowak advises urban land managers to avoid trees that require a lot of maintenance, as the burning of fossil fuels to power equipment like trucks and chainsaws will only erase the carbon absorption gains otherwise made.

Plant Any Tree Appropriate for Region and Climate to Offset Global Warming

Ultimately, trees of any shape, size or genetic origin help absorb CO2. Most scientists agree that the least expensive and perhaps easiest way for individuals to help offset the CO2 that they generate in their everyday lives is to plant a tree…any tree, as long as it is appropriate for the given region and climate.

(by Larry West, about.com)

The Five Most Important Things You Can Do for the Environment

If you feel you’re not doing enough for the environment by replacing your incandescent light bulbs with CFL or LED lights and composting your kitchen garbage, maybe you’re ready to make a deeper commitment to environmental stewardship.
Some of these strategies may seem a little radical, but they are among the most valuable actions you can take to protect and preserve Earth’s environment.

Have Fewer Children—or None
Overpopulation is arguably the world’s most serious environmental problem, because it exacerbates all of the others. The global population grew from 3 billion in 1959 to 6 billion in 1999, an increase of 100 percent in just 40 years. According to current projections, the world population will expand to 9 billion by 2040, a slower growth rate than during the last half of the 20th century but one that will leave us with many more people to accommodate.
Planet Earth is a closed system with limited resources—only so much fresh water and clean air, only so many acres of land for growing food. As the world population grows, our resources must stretch to serve more and more people. At some point, that will no longer be possible. Some scientists believe we have already passed that point.
Ultimately, we need to reverse this growth trend by gradually bringing the human population of our planet back down to a more manageable size. This means more people must decide to have fewer children. This may sound pretty simple on the surface, but the drive to reproduce is fundamental in all species and the decision to limit or forgo the experience is an emotional, cultural or religious one for many people.
In many developing countries, large families can be a matter of survival. Parents often have as many children as possible to ensure that some will live to help with farming or other work, and to care for the parents when they are old. For people in cultures like these, lower birth rates will only come after other serious issues such as poverty, hunger, poor sanitation and freedom from disease have been adequately addressed.
In addition to keeping your own family small, consider supporting programs that fight hunger and poverty, improve sanitation and hygiene, or promote family planning and reproductive health in developing nations.

Use Less Water—and Keep It Clean
Fresh, clean water is essential to life—no one can live long without it—yet it is one of the scarcest and most endangered resources on our increasingly fragile planet.
Water covers more than 70 percent of the Earth’s surface, but most of that is salt water. Freshwater supplies are much more limited, and today a third of the world’s people lack access to clean drinking water. According to the United Nations, 95 percent of the cities worldwide still dump raw sewage into their water supplies. Not surprisingly, 80 percent of all illnesses in developing countries can be linked to unsanitary water.
Use only as much water as you need, don’t waste the water you do use, and avoid doing anything to taint or endanger water supplies.

Eat Responsibly
Eating locally grown food supports local farmers and merchants in your own community as well as reducing the amount of fuel, air pollution and greenhouse gas emissions required to move the food you eat from the farm to your table. Eating organic meat and produce keeps pesticides and chemical fertilizers off your plate and out of rivers and streams.
Eating responsibly also means eating less meat, and fewer animal products such as eggs and dairy products, or perhaps none at all. It’s a matter of good stewardship of our finite resources. Farm animals emit methane, a potent greenhouse gas that contributes to global warming, and raising animals for food requires many times more land and water than growing food crops.
Livestock now use 30 percent of the planet’s land surface, including 33 percent of farmland worldwide, which is used to produce animal feed. Every time you sit down to a plant-based meal instead of an animal-based meal, you save about 280 gallons of water and protect anywhere from 12 to 50 square feet of land from deforestation, overgrazing, and pesticide and fertilizer pollution.

Conserve Energy—and Switch to Renewable Energy
Walk, bike and use public transportation more. Drive less. Not only will you be healthier and help to preserve precious energy resources, you’ll also save money. According to a study by the American Public Transportation Association, families that use public transportation can reduce their household expenses by $6,200 annually, more than the average U.S. household spends on food every year.
There are dozens of other ways you can conserve energy—from turning off lights and unplugging appliances when they are not in use, to substituting cold water for hot whenever practical and weather stripping your doors and windows, to not overheating or overcooling your home and office. One way to start is to get a free energy audit from your local utility.
Whenever possible, choose renewable energy over fossil fuels. For example, many municipal utilities now offer green energy alternatives so that you can get some or all of your electricity from wind, solar or other renewable energy sources.

Reduce Your Carbon Footprint
Many human activities—from using coal-fired power plants to generate electricity to driving gasoline-powered vehicles—cause greenhouse gas emissions that contribute to climate change.
Scientists are already seeing significant climate changes that point to the likelihood of serious consequences, from increasing drought that could further reduce food and water supplies to rising sea levels that will submerge islands and coastal regions and create millions of environmental refugees.
Online calculators can help you measure and reduce your personal carbon footprint, but climate change is a global problem that requires global solutions and, so far, the world’s nations have been slow to find common ground on this issue. In addition to lowering your own carbon footprint, let your government officials know that you expect them to take action on this issue—and keep the pressure on until they do.

(by Larry West, about.com)