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Who Releases the Most Greenhouse Gases?
Learn how the world measures greenhouse gas emissions and how different approaches imply different levels of responsibility.
Why Did World War II Happen?
In this free resource on World War II, understand the causes of World War II and why these issues drove countries back to battle just two decades after World War I.
What Is Fascism?
In this free resource, learn how Benito Mussolini and Adolf Hitler rose to power and the lessons their political journeys hold for today.
How Did Humans Come to Live Longer and Healthier Lives?
From the history of vaccines and medical quarantines to the origin of the World Health Organization, explore how innovations in global health increased human longevity and prepared the world for COVID-19.
Sources of Energy: A Comparison
Learn how turning toward cleaner energy sources means factoring in economic and energy needs alongside environmental ones.
How Climate Change Can Get Even Worse
Climate change can amplify itself through feedback loops. It can also trigger catastrophic “tipping points.”
How State and Local Governments Can Fight Climate Change
When it comes to climate action, the federal government can coordinate and fund many measures. But state and local governments also play a critical role in helping—or hindering—the fight against climate change.
Why Did World War I Happen?
In this free resource on World War I, explore the causes and effects of the Great War to understand how the conflict shaped world history.
How Did Mass Production and Mass Consumption Take Off After World War II?
Discover how consumer goods have become cheap and ubiquitous in the global era.
Why Electric Grids Need to Be More Resilient
Severe weather is causing costly disruptions. To protect the energy grid, countries need a smarter plan.