A friend says, 'The Earth has always had climate changes in the past, so today's global warming is nothing new.' How would you respond using what you've learnt in this and other chapters of your science book?
While it is true that Earth has experienced climate changes throughout its history, today's global warming is fundamentally different in both cause and speed.
Past climate changes occurred naturally over thousands or millions of years due to factors like volcanic activity, changes in Earth's orbit, or solar variations. Living beings had time to adapt gradually.
However, current global warming is happening much faster—within just a few decades—and is primarily caused by human activities, specifically burning fossil fuels like coal and oil.
The chapter explains that burning fossil fuels releases extra carbon dioxide that was locked underground for millions of years. The Earth cannot absorb this fast enough, so heat builds up rapidly.
This rapid change gives plants and animals insufficient time to adapt.
Additionally, the scale of human impact is unprecedented—we are simultaneously destroying forests that absorb carbon dioxide, reducing Earth's natural ability to regulate temperature.
The Paris Agreement's goal to limit warming to below 1.5°C reflects scientific consensus that current warming rates pose serious risks to life on Earth.
Explanation
The chapter explains that 'Burning fossil fuels like coal and oil releases greenhouse gases like carbon dioxide and methane' and that 'we release extra carbon that has been locked underground for millions of years. The Earth cannot absorb this fast enough.' It also mentions the Paris Agreement goal and that 'as of 2025, the world is not on track to meet that goal.'
Solution Steps
Past climate changes occurred naturally over thousands or millions of years due to volcanic activity, Earth's orbital changes, or solar variations, allowing living beings time to adapt gradually.
Current global warming is happening within just a few decades, making it much faster than historical climate changes.
The primary cause of current global warming is human activities, specifically burning fossil fuels like coal and oil.
Burning fossil fuels releases extra carbon dioxide that was locked underground for millions of years, and the Earth cannot absorb it fast enough.
The rapid rate of change gives plants and animals insufficient time to adapt.
Human impact is unprecedented because we are simultaneously destroying forests that naturally absorb carbon dioxide.
The Paris Agreement's goal to limit warming to below 1.5°C reflects scientific consensus on serious risks to life on Earth.