Topics › Environment
Environment
Climate, energy and ecosystems: what is changing, why, and what the trade-offs are. 25 explainers
- What is plate tectonics?
Plate tectonics is the theory that Earth's rigid outer shell is broken into large plates that move a few centimeters per year. Driven by heat in the mantle, their colliding, grinding, and pulling apart builds mountains, opens oceans, and triggers earthquakes.
- How do clouds form and make rain?
Clouds form when moist air rises, cools, and its water vapor condenses onto tiny airborne particles into droplets. Rain falls when those droplets grow heavy enough—by colliding and merging or by ice-crystal growth—to overcome the rising air and fall.
- What's inside the Earth?
The Earth is built from four main layers: a thin rocky crust, a thick mantle of slowly flowing hot rock, a liquid iron-nickel outer core, and a solid iron-nickel inner core at the center.
- How did oil and coal actually form?
Both are buried, transformed remains of once-living things. Coal formed from land plants that piled up in ancient swamps; oil and natural gas formed mostly from marine plankton and algae buried in seafloor mud. Heat, pressure, and millions of years did the rest.
- How do hurricanes form?
A hurricane forms when warm tropical ocean water evaporates, rises, and condenses into storm clouds, releasing heat that pulls in more moist air. Earth's rotation twists this inflow into a spinning, self-feeding system of thunderstorms.
- What is an ecosystem?
An ecosystem is a community of living organisms (plants, animals, microbes) interacting with each other and with their physical environment as a system.
- Climate Policy vs Economic Reality
Climate policy aims to reduce emissions through regulations, carbon pricing, and green investments, but faces tensions with economic growth, energy security, and political feasibility, creating debates over the pace and cost of transition.
- What Is Sustainable Agriculture
Sustainable agriculture produces food while conserving resources, maintaining soil health, minimizing pollution, and ensuring economic viability through practices like crop rotation, integrated pest management, and regenerative techniques.
- What Is Net Zero Emissions
Net zero means balancing emissions produced with emissions removed from the atmosphere through carbon sinks or capture, requiring massive emissions cuts to ~10% of current levels plus removal of residual emissions.
- How do oceans regulate Earth's climate?
Oceans stabilize climate through their vast heat and carbon storage.
- What is the difference between weather and climate?
Weather refers to short-term atmospheric conditions (hours to days): temperature, humidity, precipitation, wind, etc.
- What causes climate change?
Climate change (global warming) is primarily driven by increased greenhouse gases (GHGs) from human activities.
- How Sustainable Development Works
Sustainable development meets present needs without compromising future generations' ability to meet theirs, balancing economic growth, social equity, and environmental protection through the UN's 17 Sustainable Development Goals.
- Understanding Energy Grids and Smart Grids
Energy grids distribute electricity from generators to consumers through transmission and distribution networks, with smart grids adding digital monitoring and automation to improve efficiency, reliability, and integrate renewables.
- What Is Geothermal Energy
Geothermal energy harnesses heat from Earth's interior through wells drilled into hot rock or fluids, producing consistent baseload power and heating with minimal emissions.
- Understanding Wind Energy
Wind turbines convert kinetic energy from moving air into electricity using aerodynamic blades that spin generators, providing clean, renewable power with costs now competitive with fossil fuels.
- How Electric Vehicles Work
Electric vehicles use battery packs to power electric motors, eliminating tailpipe emissions and offering lower operating costs, though battery production, charging infrastructure, and electricity grid carbon intensity affect overall environmental benefit.
- What Is the Circular Economy
The circular economy designs out waste by keeping products and materials in use through repair, reuse, refurbishment, and recycling, replacing the linear 'take-make-dispose' model.
- Understanding Water Scarcity
Water scarcity affects 4 billion people annually, driven by over-extraction, pollution, climate change, and population growth, threatening food security, health, and conflict.
- How Deforestation Affects Climate
Deforestation contributes ~10% of global greenhouse gas emissions, removes carbon sinks, disrupts water cycles, and reduces albedo, creating feedback loops that accelerate climate change.
- What Is Biodiversity Loss
Biodiversity loss is the decline in variety and abundance of species, genes, and ecosystems, driven by habitat destruction, climate change, pollution, and overexploitation, threatening ecosystem services humanity depends on.
- Understanding Ocean Acidification
Ocean acidification occurs when atmospheric CO2 dissolves in seawater, forming carbonic acid that lowers pH and reduces carbonate ion availability, threatening shell-forming organisms and marine ecosystems.
- How Renewable Energy Storage Works
Energy storage solves renewables' intermittency using batteries (lithium-ion for short duration), pumped hydro (largest existing storage), and emerging technologies like flow batteries, compressed air, and green hydrogen for long-duration needs.
- Understanding Carbon Capture Technology
Carbon capture technologies remove CO2 from emissions or air—post-combustion capture at power plants, direct air capture from atmosphere, or natural solutions like enhanced weathering—each facing cost, scale, and energy challenges.
- How Carbon Offsets Work
Carbon offsets allow individuals or companies to compensate for emissions by funding projects that reduce or remove equivalent CO2 elsewhere, though effectiveness depends on additionality, permanence, and verification.