It's #WorldPopulationDay and the UN has just released its new World Population Prospects for 2022.

At @OurWorldInData we've built a new population data explorer for you to explore it all: ourworldindata.org/explorers/popu…

🧵👇A thread with some of the highlights:
@OurWorldInData The UN projects that the world will pass 8 billion by November this year.

However, population growth rates are slowing significantly, and have dipped below 1% in the last few years.

1/
@OurWorldInData In its medium fertility scenario, the UN now projects that the world will hit peak population in 2080 at 10.4 billion people.

In its previous release, growth continued to 10.8 billion and did not peak before 2100.

2/
@OurWorldInData The global fertility rate is now around 2.3 births per woman.

This is a fall from 5 births per woman in 1950.

Two-thirds of the world population live in countries where the fertility rate is below 2.1 – the replacement ratio.

3/
@OurWorldInData The UN expects that India will overtake China next year (2023) to become the most populous country in the world.

Its previous release expected this to happen in 2028.

4/
@OurWorldInData The new estimates include excess deaths of approximately 15 million across 2020 and 2021 – much higher than the 5.4 million confirmed COVID-19 deaths.

This figure is similar to figures published by the WHO, and a little lower than those from The Economist.

5/
@OurWorldInData You can read these findings in our article here: ourworldindata.org/world-populati…

Thanks to @lucasrodesg, @MarcelGerber9 and @redouad for the great teamwork on this.

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More from @_HannahRitchie

Jun 20
There is a new study in @NatureFoodJnl that suggests that 'food miles' account for nearly 20% of food emissions: nature.com/articles/s4301…

This is way higher than previous studies!

Except, this is not really the case & they're measuring very different things...

🧵👇
@NatureFoodJnl 'Food miles' is the distance * tonnage of food from where it's produced to where it's consumed.

This is a standard definition in the literature & how the public also thinks about it.

The authors of this study know that because they define it in the opening paragraph...

1/
@NatureFoodJnl In this study they have not only quantified emissions from the transport of *food* but also everything upstream from fertilizers, to pesticides, to machinery.

Fine to quantify that, but these are not 'food miles'. We should not just overwrite an already-established concept

2/
Read 13 tweets
May 30
For millennia, humans have used more and more land for agriculture, taking over wild habitats.

But, we are at a unique point in history: agricultural land use has peaked.

My latest article:
ourworldindata.org/peak-agricultu…
While agricultural land use has fallen, the amount of food we produce has continued to increase.

This is a decoupling we saw much earlier in today's rich countries, but is now true at the global level.
It's important to understand what's driving this change.

Global pasture land has peaked. Global cropland has not.

How can this be, when we produce more meat than ever?

I explain in the article 👇

2/
Read 6 tweets
May 23
Humans have driven many of the world's mammals to extinction. This threat has been persistent throughout our history.

But, recent conservation efforts show that it doesn't have to be this way.

Mammals are making a comeback across Europe.

My new article: ourworldindata.org/europe-mammal-…
As I covered in a recent @OurWorldInData article, the largest mammals have always been at the greatest risk of extinction.

This is still the case across the world today.

1/

ourworldindata.org/large-mammals-…
@OurWorldInData But we are now in a very unique position. We can be the ones to turn the tide – bringing wildlife back, rather than pushing it to extinction.

This is happening across Europe. Conservation efforts over the past 50 years have been extremely successful.

2/
Read 8 tweets
Apr 4
What is the world's most pressing problem?

Many answers. Increasing agricultural productivity across Sub-Saharan Africa makes it into my top five.

It's vital to reduce hunger, poverty and biodiversity loss.

My latest post: ourworldindata.org/africa-yields-…
Labor productivity in agriculture across Sub-Saharan Africa (and most countries in the region – obviously there is significant heterogeneity) is very low.

Most work in farming and earn very little.

To reduce poverty, labor productivity has to increase

1/
Crop yields have increased in many countries in recent decades, but are still very low.

Yields lag behind other regions, and are a small % of attainable yields.

To preserve natural habitat, yields need to increase.

2/
Read 6 tweets
Mar 20
Many people could face hunger this year as a result of rising food prices, and reduced exports from Ukraine & Russia.

What could we do, and can this change quickly enough?

Thread with some numbers for perspective 👇
To be clear: any food shortages would not be because the world does not grow enough to feed everyone.

The world uses about 214 million tonnes of maize for industrial uses (mostly biofuels).

US biofuels alone is several multiples higher than Ukraine + Russian exports 👇
For wheat, there is less potential for displacement from biofuels. Especially if the world was to limit exports from Russia, which are large.

Important for food security to not limit Russian food exports if we cannot manage supply from elsewhere.

2/
Read 11 tweets
Mar 18
Next week the @IEA will hold its 2022 ministerial meeting.

Countries have the option to make global energy data free & open for everyone. It's even more important now.

@MaxCRoser & I explain why, with a new section on energy security👇

ourworldindata.org/iea-open-data Image
@IEA @MaxCRoser Understanding energy dependency, security & trade across the world has been critical in recent weeks.

You'd think that this would be easy, but it's not.

Researchers have been scrambling to try to find very basic but critical data on energy trade across the world.

1/
@IEA @MaxCRoser The @IEA has this data but nearly all of it is locked behind paywalls, costing hundreds of dollars each.

Even if you purchase a license, you then cannot share the data with others.

2/ Image
Read 6 tweets

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