Very little of Earth remains the same as 500 years ago. According to new research, as little as 3 per cent of land surfaces are still home to their full range of native species, unspoilt by human activity.
Reported in Frontiers in Forests and Global Change, the finding is much lower than earlier estimates based on satellite images, which suggested around 20 to 40 per cent of land ecosystems* were undamaged.
For the new study, scientists did a large survey of forest cover and species losses to better understand what was happening below the world’s tree canopies*.
“I was particularly surprised to see how low it really is,” said Andrew Plumptre, a conservation biologist at the University of Cambridge. “It shows how rare such intact places are. It’s scary just how little the world looks like what it was just 500 years ago.”
The term ‘ecosystem’ describes the complex relationships within a natural area that help to sustain a healthy and balanced diversity of life. Losing just one or two key species puts the whole system at risk.
Habitats* containing the same species abundance* as in the year 1500AD were mostly in regions less liveable for humans, like the Sahara Desert and very cold parts of Greenland and northern Canada.
Some scientists argued the study used a very narrow definition of ‘intact habitats’: those with their full, historical collection of animals and plants.
“We need practical actions to ensure species and ecosystems survive,” said Stuart Pimm, a conservation scientist at Duke University.
He added that frozen and desert patches are not the most abundant with species.
“Encouraging nations to protect remote, sparsely populated areas won’t do biodiversity a lot of good,” Pimm said.
An effort led by the United Nations to protect 30 per cent of the planet’s land and waters by 2030 – up from 17 per cent – has gained support over the last year, as governments including the United States pledge to commit more land to conservation.
Other conservationists argue the goal should be much higher to prevent mass extinction of species. A 2019 UN report estimated as many as one million species are under threat of extinction due to human activity.
Robots fan across the world monitoring ocean health
Meanwhile oceanographers* are releasing robots across the planet to monitor ocean health.
The project known as the Global Ocean Biogeochemistry Array (GO-BGC) started in March, with the first of 500 new floating robotic monitors containing computers, hydraulics, batteries and an array of sensors scientists say will relay a more complete picture.
“The ocean is extremely important to the climate, to the sustainability of the Earth, its supply of food, protein to enormous numbers of people. We don’t monitor it very well,” said Ken Johnson, GO-BGC’s project director and a senior scientist at California’s Monterey Bay Aquarium Research Institute (MBARI).
“The goal is to be able to monitor the health of the ocean in places where people only go once a decade.”
Measurements will be taken at depths of one and two km and data sent to shore via satellite. Each survey will take about 10 days and the data will be available to research institutions and schools free of charge.
- ecosystems: interacting organisms and their environment
- canopies: uppermost tree cover
- habitats: natural or preferred home
- abundance: a large quantity, plenty
- oceanographers: those who study the physical and biological aspects of the ocean
- hydraulics: the science and technology of moving liquids
- The study found what percentage of the Earth’s surface remains untouched?
- Name three regions that have the same quantity of species as in 1500AD?
- How many robots are in the GO-BBC oceanography project?
- Measurements will be taken at what depths?
- How many species are under threat of extinction, according to a 2019 UN report?
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1. Name the Robots
Think of a new name for the robotic monitors that are going to be used as part of the Global Ocean Biogeochemistry Array.
Your name should be catchy and suit the work that the robots will be doing. Don’t forget to write sentences explaining your choice of name.
Time: allow 15 minutes to complete this activity
Curriculum Links: English, Science
Do you agree with the United Nations that we should preserve 30 per cent of our planet’s land and waters by 2030 or do you agree with the conservationists that say that the goal should be higher?
Write down specific reasons for your answer. Make sure that they are convincing!
Time: allow 20 minutes to complete this activity
Curriculum Links: English, Geography, Science
Scan through the article and see if you can locate three words that you consider to be basic, or low level. These are words we use all the time and that can be replaced by more sophisticated words. Words like “good” and “said” are examples of overused words.
Once you have found them, see if you can up-level them. Think of synonyms you could use instead of these basic words, but make sure they still fit into the context of the article.
Re-read the article with your new words. Did it make it better? Why/why not?