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What is Climate?

Illustration showing the difference between weather (daily changes like sun, rain, snow) and climate (long-term patterns over decades)
Climate is the long-term pattern of weather in a particular area

Climate is the average weather conditions in a place over a long period of time—usually 30 years or more. While weather can change in just a few hours, climate changes slowly over decades or centuries.

Think of it this way: Weather tells you what to wear today, while climate tells you what clothes to have in your closet for different seasons!

Natural Climate Factors

Diagram showing natural factors affecting climate including latitude, altitude, ocean currents, and wind patterns
Many natural factors influence Earth's climate patterns

Earth's climate is influenced by many natural factors that have existed for millions of years. These factors work together to create the different climate zones around our planet:

Latitude

Distance from the equator affects temperature. Areas near the equator receive more direct sunlight and are warmer.

Impact: Creates tropical, temperate, and polar zones

Altitude

Higher elevations have cooler temperatures because the air is less dense and holds less heat.

Impact: Mountains have cooler climates than nearby lowlands

Ocean Currents

Moving ocean waters transfer heat around the planet, warming some regions and cooling others.

Impact: The Gulf Stream keeps Europe warmer than similar latitudes

Prevailing Winds

Global wind patterns move air masses and moisture around the planet, affecting rainfall and temperature.

Impact: Creates wet and dry regions based on wind direction

Topography

Mountains, valleys, and other landforms affect how air moves and where precipitation falls.

Impact: Rain shadows create deserts on the downwind side of mountains

Human Influences on Climate

Illustration showing human activities that impact climate including factories, vehicles, deforestation, and agriculture
Human activities are changing Earth's climate in significant ways

While natural factors have always influenced climate, human activities are now causing rapid changes to Earth's climate system. These activities release greenhouse gases that trap heat in the atmosphere:

Burning Fossil Fuels

Coal, oil, and gas release carbon dioxide when burned for energy

Transportation

Cars, trucks, ships, and planes burn fuel and release emissions

Deforestation

Cutting down forests reduces Earth's ability to absorb carbon dioxide

Agriculture

Farming practices release methane and other greenhouse gases

These human activities have increased the concentration of greenhouse gases in the atmosphere to levels not seen in at least 800,000 years, causing the Earth to warm at an unprecedented rate.

The Greenhouse Effect

Diagram illustrating the greenhouse effect with sunlight entering the atmosphere, some being reflected, and some trapped by greenhouse gases
The greenhouse effect naturally warms Earth, but human activities are enhancing it

The greenhouse effect is a natural process that keeps our planet warm enough for life. Sunlight passes through the atmosphere and warms Earth's surface. Some of this heat is radiated back toward space, but greenhouse gases trap some of it, keeping our planet at a comfortable average temperature of about 15°C (59°F).

Without the natural greenhouse effect, Earth would be too cold for life as we know it—about -18°C (0°F)! However, human activities are adding extra greenhouse gases to the atmosphere, making this effect stronger and causing global warming.

Climate Change Impacts

Visual representation of climate change impacts including melting ice, extreme weather, sea level rise, and ecosystem changes
Climate change is affecting ecosystems and communities worldwide

The changing climate is already affecting our planet in many ways. These impacts are expected to become more severe if warming continues:

Rising Temperatures

Global average temperature has increased by about 1°C (1.8°F) since the late 1800s.

Impact: More frequent and intense heatwaves

Sea Level Rise

Melting ice and expanding warm water are causing sea levels to rise.

Impact: Coastal flooding and erosion

Extreme Weather

Climate change is making some weather events more severe.

Impact: Stronger hurricanes, heavier rainfall, worse droughts

Ecosystem Changes

Plants and animals are struggling to adapt to rapid changes.

Impact: Coral bleaching, shifting habitats, species extinction

Climate Solutions

Illustration showing climate solutions including renewable energy, tree planting, sustainable transportation, and energy efficiency
Many solutions exist to address climate change and create a sustainable future

The good news is that we have many solutions to address climate change! By working together—governments, businesses, communities, and individuals—we can reduce greenhouse gas emissions and build a more sustainable future:

Clean Energy

Switching to solar, wind, and other renewable energy sources

Energy Efficiency

Using less energy through efficient appliances and buildings

Sustainable Transportation

Walking, biking, public transit, and electric vehicles

Circular Economy

Reducing waste and reusing materials

Individual actions matter too! Things like eating less meat, reducing food waste, using energy wisely, and talking about climate change with others can all make a difference when millions of people do them.

Climate Factors Quiz

Test your climate knowledge with this quiz! Answer all 5 questions to see how much you've learned.

1. What is the main difference between weather and climate?
2. Which natural factor affects climate based on distance from the equator?
3. What human activity contributes most to climate change?
4. What is the greenhouse effect?
5. Which of these is NOT a impact of climate change?

Frequently Asked Questions

Here are answers to some common questions about climate factors:

Science Trivia

Discover some amazing facts about climate and our planet!

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