How many people live on Earth, roughly?
AnswerAbout 8 billion
World population passed 8 billion in late 2022 (UN).
Outdoors · Facts & stats
Challenge Earth facts & stats
7 fact-checked facts about a standing invitation to do something for the planet this week, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which renewable source grew fastest worldwide in the early 2020s?
AnswerSolar PV
Solar additions set records every year; 2023 added over 400 GW globally (IEA).
Going deeper
What is a 'nature-based solution'?
AnswerUsing ecosystems like wetlands or forests to tackle problems such as floods or carbon
Restoring mangroves to blunt storm surge is a classic example.
Which meal swap saves the most emissions?
AnswerBeef to beans
Replacing beef with legumes cuts a meal's footprint by roughly 90%.
What does 'circular economy' aim to do?
AnswerKeep materials in use and design out waste
Circularity means repair, reuse, remanufacture and recycle instead of take-make-waste.
Expert level
Which country generates the largest share of its electricity from renewables?
AnswerSeveral, including Iceland, Norway and Paraguay, are near 100%
Hydro and geothermal give those countries almost entirely renewable grids.
The Kunming-Montreal Global Biodiversity Framework (2022) set a target to protect how much land and sea by 2030?
Answer30%
The '30 by 30' target was agreed at COP15 of the Convention on Biological Diversity.
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