NATURAL ENVIRONMENT AND CHANGES
At present time the most evident and serious signs of deterioration of nature and ecological services are climate change (increased air and water temperature, glaciers and ice shelf melting, sea level rise, ocean acidification), deforestation, desertification, further loss of habitat to agriculture and construction, loss of biodiversity, pollution of land, water and air including increasing greenhouse gases (GHG).
"more than 11,000 scientist signatories from around the world, clearly and unequivocally [declared] that planet Earth is facing a climate emergency".
Ripple et al. 2019

Relation between temperature and emissions
Graphs from Met office
AIR TRAVEL
References;
Anderson K, Bows A (2008). Reframing the climate change challenge in light of post-2000 emission trends. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (366:1882, p.3863-3882)
Kerry Reals (7 January 2019). "Don't count on technology to save us". Flightglobal.
WHAT YOU CAN DO AT HOME
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Plant trees or buy trees to be planted in this new forest
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Give up the daily use of car, prefer public transport
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Change your car with an electric vehicle
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Prefer holiday destinations that you can reach by train
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Install solar panels
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Use energy efficient appliances
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Eat more vegetarian food and limit consumption animal proteins
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Avoid flown-in produce
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Do not change your e-devices if they are still working
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Buy second hand, reuse, recycle
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do not use a dryer for your clothes, use the sun!
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Share with others
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More scientific info on Climate Solutions at : https://www.drawdown.org/