Earth’s Energy Imbalance: Why Our Planet Is Heating Up

Have you ever stepped outside on a sunny day (it’s 78 today where I live!) and felt the warmth of the Sun on your skin? That sunlight is energy—and it’s what keeps our planet livable.

But here’s the problem: Earth is now taking in more energy than it sends back out to space.

Scientists call this an energy imbalance, and it’s the main reason our planet is warming.

Scientists have been tracking this imbalance since the late 1980s. But things really improved in 2000, when Terra satellite began collecting detailed data using NASA’s CERES instrument. That mission gave us the first long-term, high-accuracy global record of Earth’s energy imbalance.

How Earth’s Energy System Works

Think of Earth like a giant bank account for energy.

• The Sun “deposits” energy into Earth
• Earth “withdraws” energy by sending heat back into space

When deposits and withdrawals are equal, everything stays balanced.

But right now? We’re running a surplus.

What Is Earth’s Energy Imbalance?

Earth’s energy imbalance happens when:

👉 More energy comes in from the Sun than leaves the planet

That extra energy doesn’t just disappear—it gets stored in Earth’s system.

And most of it ends up in one place…

The Ocean Is Doing the Heavy Lifting

The ocean absorbs over 90% of the extra heat trapped by greenhouse gases.

That might sound like a good thing—and in a way, it is. The ocean is slowing down how fast the air warms.

But there’s a catch.

Warmer oceans can lead to:

• Stronger storms
• Coral bleaching
• Marine heatwaves
• Rising sea levels (because warm water expands)

So the ocean is helping us—but it’s also under stress. It’s where the biggest changes are happening.

What’s Causing Earth’s Energy Imbalance?

The main cause is something you’ve probably heard about: greenhouse gases.

These gases—like carbon dioxide (CO₂)—act like a blanket around Earth.

They trap heat that would normally escape into space.

Since the Industrial Revolution, humans have added huge amounts of these gases by:

• Burning fossil fuels (coal, oil, gas)
• Cutting down forests
• Running cars, factories, and power plants

The result? That “blanket” is getting thicker and holding in more heat.

Why Should We Care?

Even a small energy imbalance can have a big impact over time.

Think of it like slowly filling a bathtub. At first, it doesn’t seem like much—but eventually, it overflows.

Earth’s extra energy is already causing:

• Rising global temperatures
• Melting ice sheets and glaciers
• Rising sea levels
• More extreme weather

How Do Scientists Know This?

I briefly mentioned this in the introduction.

Scientists track Earth’s energy in several ways:

• Satellites measure energy coming in and going out
• Ocean sensors (like Argo floats) track heat in the ocean
• Weather stations measure temperatures on land

All of these lines of evidence point to the same conclusion:

👉 Earth is gaining energy.

👉 Global warming isn’t just about hotter air—it’s about extra energy building up in Earth’s system.

As long as more energy is coming in than going out, the planet will keep warming.

What Can We Do?

To fix the imbalance, we need to:

• Reduce greenhouse gas emissions
• Switch to clean energy like wind and solar
• Protect forests and natural ecosystems

The good news? We already have many of the solutions. We just need the political will.

The sooner we act, the better chance we have to protect the world we all love and share.

If you’re interested in more details, the World Meteorological Organization’s State of the Climate 2025 report is available here.