Climate change is not a distant threat; it is a present reality and arguably the single greatest challenge facing humanity in the 21st century. It refers to long-term shifts in glo
Faglig kvalitetssikret av lærere og toppstudenter · Følger læreplanen (LK20) · Sist oppdatert 2026-07-16
Introduction
Climate change is not a distant threat; it is a present reality and arguably the single greatest challenge facing humanity in the 21st century. It refers to long-term shifts in global temperatures and weather patterns, driven primarily by human activity. The overwhelming scientific consensus is that our planet is warming at an unprecedented rate, with profound consequences for our ecosystems, our economies, and our way of life. This article will break down the science behind climate change, its causes, its devastating effects, and the solutions we must pursue to secure a sustainable future.
Learning objectives
After reading this article, you should be able to:
- Explain the difference between the natural and the enhanced greenhouse effect.
- Identify the main human activities that contribute to climate change.
- Describe the major effects of global warming on the planet.
- Distinguish between climate change mitigation and adaptation.
- Understand the importance of international cooperation, such as the Paris Agreement.
The Science: The Enhanced Greenhouse Effect
The Earth's climate is regulated by a natural process called the greenhouse effect. When sunlight reaches the Earth, some of it is absorbed, warming the planet, while some is reflected back into space. Certain gases in the atmosphere, known as greenhouse gases (like carbon dioxide, CO2), trap some of this outgoing heat, acting like the glass walls of a greenhouse. This natural effect is essential for life; without it, the Earth would be a frozen, uninhabitable planet. …