Balancing Trees and CO₂ Tree planting used to be regarded as an effective means of reducing climate change.Perhaps it's time for us to rethink this practice.Trees pull CO₂ from the air.This effectively removes CO₂ from the atmosphere.But trees only hold onto CO₂ as long as they're alive.Once they die，trees decay（腐爛） and release that CO₂ back into the atmosphere.
    Recent studies have found that trees around the world are growing faster than ever.The rise of CO₂ ，mainly due to burning fossil fuels，is probably driving that rapid growth，said Roel Brienen，a forest ecologist at the University of Leeds，UK.High levels of CO₂ are increasing temperatures，which in turn speeds tree growth in those areas，he added.
    The faster trees grow，the faster they store carbon.It seems like good news.However，it is known that fast-growing tree species，in general，live shorter lives than their slow-growing relatives.
    In order to see whether the growth-lifespan trade-off（生長(zhǎng)與壽命之間的權(quán)衡） is a universal phenomenon，Brienen and his colleagues analyzed over 210，000 individual tree ring records of 110 tree species from more than 79，000 sites worldwide.They found that，in almost all habitats and all sites，faster-growing tree species died younger than slow-growing species，and even within a species，the trade-off between growth and lifespan held strong.
    The team also created a computer program that modeled a forest and tweaked（微量調(diào)整）the growth of the trees in this model.Early on，it showed that "the forest could hold more carbon as the trees grew faster"，Brienen reported.But after 20 years，these trees started dying and losing this extra carbon again. "We must understand that the only solution to bringing down CO₂ levels is to stop emitting （排放） it into the atmosphere，" said Brienen.

（1）What does "this practice" in Para.1 refer to？

Planting trees to reduce climate change. /Tree planting is used to reduce climate change. /Using tree planting to reduce climate change.

Planting trees to reduce climate change. /Tree planting is used to reduce climate change. /Using tree planting to reduce climate change.

（2）Why are trees around the world growing faster than ever？

Because of the rise of CO₂from burning fossil fuels. /Because of the rise of CO₂. /Because burning fossil fuels leads to the rise of CO₂.

Because of the rise of CO₂from burning fossil fuels. /Because of the rise of CO₂. /Because burning fossil fuels leads to the rise of CO₂.

（3）Read the following statement，underline the false part of it and explain the reason.
The team has found that the faster trees grow，the faster they store CO₂ ， and the longer lives they live.

The team has found that the faster trees grow，the faster they store CO₂，andthe longer lives they live.Because Berienen and his team found that faster-growing tree species died younger than slow-growing species. /According to Berienen and his team's research，faster-growing tree species died younger than slow-growing species. /Because fast-growing tree species died younger than slow-growing species.

The team has found that the faster trees grow，the faster they store CO₂，andthe longer lives they live.Because Berienen and his team found that faster-growing tree species died younger than slow-growing species. /According to Berienen and his team's research，faster-growing tree species died younger than slow-growing species. /Because fast-growing tree species died younger than slow-growing species.

（4）Please briefly present what you can do in daily life to reduce the emission of CO₂ . （about 40 words）

Firstly，I'll take a reusable cloth bag and say no to plastic bags while shopping，for it can save energy and reduce pollution.Secondly，when I go somewhere，I'll choose public transportation instead of private cars to reduce the emission of CO₂.

Firstly，I'll take a reusable cloth bag and say no to plastic bags while shopping，for it can save energy and reduce pollution.Secondly，when I go somewhere，I'll choose public transportation instead of private cars to reduce the emission of CO₂.