Earth's 4.6-billion-year journey from toxic wasteland to thriving planet

Earth has evolved dramatically over 4.6 billion years. Its transformation includes the formation of its core, mantle and crust, as well as sweeping changes to its atmosphere and life forms. In its early days, the planet’s atmosphere was toxic, filled with methane, ammonia and volcanic gases. Around 2.5 billion years ago, cyanobacteria began producing oxygen through photosynthesis, gradually altering the air we breathe today.

A major burst of life occurred during the Cambrian Explosion, roughly 541 million years ago. This period saw an unprecedented diversification of species. Later, plants moved onto land about 470 million years ago, followed by insects and amphibians.

Plate tectonics reshaped Earth’s surface, creating mountains, triggering earthquakes and fuelling volcanic activity. These forces still drive change, with continents shifting about 2.5 cm each year. A catastrophic asteroid impact around 66 million years ago wiped out the dinosaurs, paving the way for new life forms to emerge.

Now, human activity plays a growing role in shaping the planet’s climate, biodiversity and geology. From its violent beginnings to the rise of complex life, Earth’s history is one of constant change. Today, natural processes and human influence continue to reshape the world in measurable ways.