时间:2019-01-02 作者:英语课 分类:(科普英语)Earth and Sky


英语课



Forests and CO2 森林和二氧化碳

The amount of fossil fuel emissions 1 released into the atmosphere has steadily 2 risen since the Industrial Revolution. But recently, part of those emissions have been disappearing. Learn more about forests and CO2 -- on today's Earth and Sky.

DB: This is Earth and Sky. When we burn fossil fuels, we send carbon dioxide -- or CO2 -- into the air. Most scientists think this CO2 contributes to global warming. In the past 20 years, levels of CO2 in the atmosphere haven't risen as much as expected from the rate of our CO2 emissions. Researchers think forests are absorbing some of this extra CO2.

Steven Wofsy: They're doing us a very big favor. They're taking 25% of the fossil fuel CO2 and making it disappear from the atmosphere...

DB: Steven Wofsy researches atmospheric 3 and environmental chemistry at Harvard University.

Steven Wofsy: So we'd very much like to understand why plants are doing this now -- they weren't doing it 20 years ago and what holds the future ... Perhaps plants will continue to take up CO2, perhaps they won't, perhaps what's been stored will actually come back into the atmosphere.

DB: Global warming has extended the growing season and the amount of CO2 that plants can absorb in a year. But Wofsy said that global warming could eventually damage forests by favoring pests. He's helping 4 to design new satellite instruments to better measure how much CO2 is exchanged between forests, oceans and the air. For more, come to today's show at earthsky.org. Special thanks to the National Science Foundation -- where discoveries begin. I'm Deborah Byrd for Earth and Sky.


排放物( emission的名词复数 ); 散发物(尤指气体)
  • Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
  • Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。
adv.稳定地;不变地;持续地
  • The scope of man's use of natural resources will steadily grow.人类利用自然资源的广度将日益扩大。
  • Our educational reform was steadily led onto the correct path.我们的教学改革慢慢上轨道了。
adj.大气的,空气的;大气层的;大气所引起的
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
n.食物的一份&adj.帮助人的,辅助的
  • The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
  • By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
学英语单词
a string attached
Agung, Gunung
angina trachealis
annual working
anti-goyish
astrographic chart
be rough on sb.
benanti
biomat
boron-trifluoride-filled counter
business continuance volume
business process execution language for web services
capacitance-type strain ga(u)ge
carcinomatous invasion
cereal testing machine
chromascan
collegiums
configuration of surface
decimal dust
deep hole boring
Dikanda-Kapula
Dioctophymatoidea
disodium methyl arsenate
distressful
dunser
dynal
Elf Aquitaine
empty tape
epiphenomenalisms
exponible
extrapolated onset
fee-faw-fums
first-impression error
furnace resistor
Hasnon
high-vacuum pump
hoilman
homogeneous planar flow
hovertrains
hydroperoxys
idyous
immediate employment
intercontinental through-shipment
internal fixation with stainless plate
Ionex
Iris tectorum
jestings
juicy girl
keep the post
less than optimal
low-level extraction of parachute-retarted cargo (lolex)
mistaggings
Nisidon
not worth the powder and shot
open-nicol
oxadiazinane
panulirus penicillatus
parasitic infection
peekers
phalloidin
phenomenological theory
placing of well
plantarly
plausibilize
polygenetic mineralization
population structure
postrenal
pouring spout
power steering mechanism
profile in plan
put him in to get him out
reciprocating positive displacement pump
resequence
road shows
Robert the Bruce
Rossel's aloin test
sample issue
self professed
semipersistent
springform tin
Steblevë
Stefansson Bay
strobill
sub-region
submergent
super-high frequency engineering
synchronous phase modifier
Syneilesis subglabrata
technological knowledge
testing production
tetanus of newborn
theoreticalness
three-engined aircraft
Tongoloa elata
tunnelluminescence
unwittingness
us position
warning indicator
webge gate valve
whizz-kid
willow families
wing house