Global challenges today
The twenty-first century world faces shared challenges, from climate change and pandemics to shifting power and debates about democracy.
Climate change
Human activity, mainly burning fossil fuels, has raised atmospheric carbon dioxide from about 280 ppm before industrialisation to over 420 ppm, warming the planet by about 1.1-1.3 degrees C. The Paris Agreement (2015) committed nations to limit warming to well below 2 degrees C and pursue 1.5 degrees C, but emissions reductions have lagged.
Pandemics and global health
The COVID-19 pandemic, declared by the WHO in March 2020, killed millions worldwide (over 7 million confirmed deaths, with estimates of excess deaths much higher), disrupted economies, and highlighted inequalities in access to vaccines and healthcare. Earlier, global efforts dramatically reduced deaths from HIV/AIDS, malaria, and childhood diseases.
Shifting global power
China's rise as an economic and military power has created rivalry with the United States in trade, technology, and security. India has become the world's most populous country (overtaking China in 2023) and a growing economy. Many observers describe an increasingly multipolar world.
War and security
Russia's full-scale invasion of Ukraine in February 2022 became Europe's largest war since 1945, prompting sanctions and the expansion of NATO to Finland (2023) and Sweden (2024). Conflicts in the Middle East, Sudan, and elsewhere caused major humanitarian crises. Nuclear proliferation and terrorism remain concerns.
Migration and refugees
International migration has grown, driven by economic opportunity, conflict, and environmental change. The UN refugee agency reported over 100 million forcibly displaced people worldwide by 2022, a record. Migration has fuelled both economic growth and political controversy in receiving countries.
Democracy and its challenges
The number of democracies grew greatly after 1974 and again after 1989. Since the mid-2000s, organisations such as Freedom House have reported declines in political freedom in many countries, with rising populism, polarisation, and authoritarian governments. Social media has transformed political communication for better and worse.
Technology and the future
Artificial intelligence, biotechnology, and renewable energy are transforming economies. Solar and wind power have become among the cheapest sources of new electricity in many regions. These technologies offer solutions to global problems while raising questions about jobs, inequality, privacy, and safety that societies must address.
Worked example
Climate change shows why global challenges are hard. Emissions from any country affect everyone, so each nation has an incentive to let others bear the costs of cutting. Historically, rich industrialised countries emitted most of the carbon already in the atmosphere, while poorer countries argue they need room to develop. Agreements like Paris try to balance responsibility, fairness, and urgency.
Key takeaways
Carbon dioxide has risen from about 280 to over 420 ppm, warming the planet; the Paris Agreement aims to limit warming. COVID-19 killed millions and exposed health inequalities. China's rise and India's growth point to a multipolar world. Russia's 2022 invasion of Ukraine expanded NATO. Over 100 million people were forcibly displaced by 2022. Democracy has faced setbacks since the mid-2000s. AI, biotechnology, and renewables bring opportunities and new questions.
Flashcard
About 280 ppm before industry, over 420 ppm today
Check your understanding
Why is climate change especially difficult to solve through international cooperation?