Ⅱ. 重要的植物
在了解了树木的重要性后，Daniel 打算在假期参与一项植树的志愿活动。(有一项多余)
A lot of health care is connected with being around trees. 1. According to one 2015 study, a walk in the woods can make you feel seven years younger.
They also do a great deal of good for the environment by reducing air pollution and taking in carbon dioxide from the atmosphere. 2. A new study by researchers at University College London found that the trees in the London Borough of Camden store as much carbon per hectare (公顷) as rainforests.
A tree's ability to take in carbon dioxide is especially useful when the tree is in cities or towns, where there are too many industrial activities. For the study, the researchers used laser scanning (扫描) methods to take their own carbon readings of trees from the ground as well as the air. 3. They were able to know there are about 85,000 trees in Camden, where the university is based.
They decided that Camden had a median carbon density (浓度) of around 55 tons of carbon per hectare (t/ha). Greener areas of the borough, like Highgate Cemetery, had a carbon density of 380 t/ha—levels that are typically seen in rainforests. 4.
So what exactly does this mean? Trees could help cool the atmosphere by removing carbon dioxide from the air. However, some climate scientists argue that it's more complicated (复杂的) than that. 5. Still, with all of the other benefits trees offer, planting a seed or two couldn't hurt.
A. We need to protect the ones we already have.
B. These benefits aren't just felt in the countryside either.
C. For comparison, major cities in the USA have a carbon density of 7.7.
D. They have been known to reduce people's stress and improve overall mental (精神的) health.
E. Then they compared their findings with the data from the UK Environment Agency.
F. They think the impact (影响) of tree - planting activities today may not be seen for many years.