A ETH Zurich researcher estimated that 400 gigaton of greenhouse gases would be removed by 3 trillion trees.
966c13ec-5d6e-4d17-af0b-690a7f102343
a24d5240-d45b-4189-b741-196f706f6416
Targeting only undeveloped land in the world, 1.2 trillion trees could be planted now.
a24d5240-d45b-4189-b741-196f706f6416
A 2017 study in the journal PNAS said reforestation would be the best means of preventing Earth's temperature from rising more than 2 degrees C. Trees take CO2 from the air through photosynthesis, and release oxygen.
If enough trees are planted, they could theoretically absorb enough CO2 to curb climate change.
f0de6e1d-8174-4189-b4ab-eefe9ddb6a9c
Contrarily, one study in the journal Nature Communications has found that the more CO2 accumulates in the air, the faster the trees grow, but the shorter they live.
aeb37b7b-8c4c-4aa6-a052-7a1a75cb34ef
Also, every square meter of forest absorbs about 1,700 grams of CO2 every year, but also releases up to 1,200 grams.
As the forest gets older, these flows level out.
2358cbb2-5baf-44aa-a431-0cb45988a8a5
Some studies claim there is not enough open space to plant new trees.
f0de6e1d-8174-4189-b4ab-eefe9ddb6a9c
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Ecologists from the University of California advised the need to protect existing forest resources and restore forests to original states.
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Another study suggests previous estimates of CO2 new forest plantations absorb from the air are overestimated.
d65ccf68-d2f3-494b-9367-ffea4c4ad8ab
This has not stopped countries like Azerbaijan.
[d801, da50]. and Kyrgyzstan.
[c6de]. from tree planting initiatives.
Azerbaijan holds regular tree planting events in order to combat climate change among other environmental reasons.
[d801, e99f]. Kyrgyzstan proposed a similar venture.
c6defd23-e273-4dcc-8425-b47d30e795db
At a UN climate summit, Pakistan promised to plant 10 billion seedlings.
f6fe76bc-5637-473e-adfe-6e8a192acab0
40 countries signed up for the Bonn Challenge to revive 350 million hectares of deforested/degraded land globally by 2030.
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Australia plans to plant a billion trees to fight climate change by 2030 to eliminate 18 million tons of greenhouse gases.
43247c4a-a2af-479e-8369-73de5d9dfdce
a613a5a0-bc80-443f-b8fa-6f35c05c3391
YouTuber Jimmy Donaldson launched a campaign - #TeamTrees to plant millions of new trees.
Elon Musk pledged $1 million and Twitter CEO Jack Dorsey pledged $150,000 to this campaign.
f0de6e1d-8174-4189-b4ab-eefe9ddb6a9c
French startup EcoTree offers clients to purchase young trees for future income.
f6fe76bc-5637-473e-adfe-6e8a192acab0
A Japanese entity traveled to the Russian Khabarovsk region to revive a cedar forest there.
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Warning: these questons and answers are not all representative of the way questions will be asked and answered in the pilot, because some questions are compound and some answers do not include citations.

Q: What does a Zurich study claim can be done with planting trees?
A: 400 gigaton of greenhouse gasses would be removed by 3 trillion trees. [966c13ec-5d6e-4d17-af0b-690a7f102343, a24d5240-d45b-4189-b741-196f706f6416]

Q: What may be detrimental to trees?
A: The more CO2 accumulates in the air, the faster the trees grow, but the shorter they live. [aeb37b7b-8c4c-4aa6-a052-7a1a75cb34ef]

Q: What arguments have been used against planting trees to combat climate change?
A: Some studies claim there is not enough open space to plant new trees. [f0de6e1d-8174-4189-b4ab-eefe9ddb6a9c]A: Europe is too urbanized. [11e7607e-1b3c-4bb6-9655-c8e6efb58c1e]A: Previous estimates of CO2 new forest plantations absorb from the air are overestimated. [d65ccf68-d2f3-494b-9367-ffea4c4ad8ab]

Q: What have studies shown that planting trees may exacerbate climate change?
A: One square meter of forest absorbs about 1,700 grams of CO2 every year, but also releases up to 1,200 grams. As the forest gets older, these flows level out. [2358cbb2-5baf-44aa-a431-0cb45988a8a5]

Q: What did University of California propose as an alternative to planting trees?
A: To protect existing forest resources and restore forests to original states. [3045d293-802a-402f-84e6-4d3ce7ae90cb]

Q: What governments have been active in planting trees to slow climate change?
A: Azerbaijan [d801c20a-d9b7-44ee-b556-f8ff86a7d8db, da50a2c5-9f41-41ef-8564-8ce525749fbc, e99f09fe-51cc-403c-b5a0-af7f1993e4c1]A: Kyrgyzstan [c6defd23-e273-4dcc-8425-b47d30e795db]

Q: What countries promised future plantings?
A: Pakistan promised to plant 10 billion seedlings. [f6fe76bc-5637-473e-adfe-6e8a192acab0]

Q: Describe the Bonn Challenge:
A: To revive 350 million hectares of deforested/degraded land globally by 2030. [d65ccf68-d2f3-494b-9367-ffea4c4ad8ab]

Q: How many countries signed up for the Bonn Challenge?
A: 40 countries [d65ccf68-d2f3-494b-9367-ffea4c4ad8ab]

Q: What has Australia planned?
A: To plant a billion trees to fight climate change by 2030 to eliminate 18 million tons of greenhouse gasses. [43247c4a-a2af-479e-8369-73de5d9dfdce, a613a5a0-bc80-443f-b8fa-6f35c05c3391]

Q: What did Elon Musk and Jimmy Dorsey pledge?
A: Elon Musk pledged $1 million and Twitter CEO Jack Dorsey pledged $150,000 to YouTuber Jimmy Donaldson’s campaign - #TeamTrees to plant millions of new trees. [f0de6e1d-8174-4189-b4ab-eefe9ddb6a9c]

Q: Describe French startup EcoTree idea:
A: clients to purchase young trees for future income. [f6fe76bc-5637-473e-adfe-6e8a192acab0]

Q: What occurred in the Khabarovsk region?
A: A Japanese entity traveled to the Russian Khabarovsk region to revive a cedar forest there. [4d3252e9-3cab-4c58-9de1-8cbdd9e39528]