David Attenborough: A Life on Our Planet (2020) Plot Summary & Timeline

From the once bustling city of Pripyat, now a desolate landscape after the catastrophic Chernobyl disaster in April 1986, David Attenborough reflects on his remarkable life journey. With a rich tapestry of archival footage showcasing his illustrious career and a diverse array of ecosystems, he poignantly narrates pivotal experiences while highlighting the intricate balance of wildlife and biodiversity on our planet. Attenborough emphasizes the critical interdependence between plants and animals, and warns that human actions are threatening this equilibrium. He asserts that if the natural world diminishes, humanity’s own survival is at stake.

In 1937, the world population stood at 2.3 billion, with 280 parts per million of carbon dioxide in the atmosphere and 66% of wilderness remaining. Fondly recalling his childhood fascination with fossils, he explains that Earth’s history is characterized by gradual changes punctuated by mass extinction events, with five significant ones recorded over the planet’s four billion-year timeline. The last such event led to the demise of the dinosaurs and approximately 75% of all species. Life, however, gradually recovered.

Throughout the Holocene epoch, which has lasted for over 10,000 years, the average temperature has remained stable within a one-degree range. This stability can be attributed to forests and phytoplankton acting as carbon sinks, while animals play essential roles in enriching soils across plains. The equatorial jungles serve as energy reservoirs, contributing moisture and oxygen vital for life. In contrast, polar ice caps reflect sunlight, helping to keep the Earth cool. This harmonious cycle has historically enabled reliable seasonal patterns, with monsoons nurturing the land and allowing human society to flourish through agriculture.

By 1954, the global population had increased to 2.7 billion, with rising carbon levels at 310 ppm and 64% of wilderness remaining. Attenborough’s documentary career took off in the 1950s at the BBC, where he traveled to places like the African Serengeti, home to vast herds of native animals that require expansive territories to sustain their grazing habits. The disruption of these grasslands threatens the integrity of the entire ecosystem.

In 1968, the Apollo mission offered a stunning perspective of Earth as a solitary and vulnerable sphere that requires protection. Progressing to 1978, the world faced a population of 4.3 billion, with carbon levels rising to 335 ppm and wilderness reduced to 55%. Over the years, Attenborough noted marked declines in wildlife, whether searching for fish or orangutans in Borneo. The declining numbers resulted in stark revelations; only 300 gorillas were spotted in the remote jungles of Central Africa, and the once thriving whale populations fell victim to human hunting. Once seen as a sport, killing whales transformed into a global outcry against the practice.

As human populations surged unchecked, without natural predators and with diseases managed, food production blossomed. However, this boon came at a steep cost; entire habitats were erased. Borneo’s rainforests, once thriving, are now half destroyed, converted to oil palm monocultures, extinguishing the region’s vital biodiversity. Attenborough starkly reveals that three trillion trees have been felled globally, with half of the world’s rainforests already lost, resulting in a dramatic two-thirds reduction in orangutan populations in Borneo.

Fast-forward to 1997, and the world population grew to 5.9 billion, with carbon levels at 360 ppm and only 46% of wilderness left. Oceans, which once seemed untouchable, have now been ravaged as fishing fleets target nutrient hot spots, decimating 90% of large fish populations since the 1950s. The removal of these fish has disrupted nutrient circulation, leading to the slow death of the oceans and the bleaching of coral reefs. As the Earth warms due to rising atmospheric carbon, the balance of life within marine ecosystems is irrevocably altered.

As the 90s progressed, the planet’s average temperature increased by one degree since the 1930s. Areas like the Arctic and Antarctic showed unprecedented changes, with summer sea ice in the Arctic reducing by 40% over 40 years. Attenborough identifies anthropogenic climate change and biodiversity loss as primary forces pushing Earth toward a sixth mass extinction, a far quicker process than the extensive timespans of previous events.

By 2020, the global population reached 7.8 billion, with atmospheric carbon at 415 ppm and only 35% of wilderness remaining. Attenborough poignantly describes his film as a “witness statement,” illustrating the consequences of current trajectories on our planet through the lens of his own lifetime. He warns that the Amazon rainforest could morph into savanna, losing moisture production and altering the global water cycle; summer ice in the Arctic may vanish, accelerating climate change; coral reefs could perish while soil depletion leads to food scarcity. These irreversible changes would catalyze mass extinctions as Earth warms by four degrees by the century’s end.

Yet, Attenborough remains hopeful, outlining potential remedies to avert these dire outcomes. He insists the solution is “staring us in the face all along.” To reestablish harmony on our planet, we need to rejuvenate its biodiversity—what has been systematically erased. He advocates for rewilding and suggests that alleviating poverty, ensuring universal healthcare, and enhancing girls’ education could stabilize the burgeoning human population. Furthermore, he promotes renewable energy sources—solar, wind, water, and geothermal—capable of sustainably meeting human energy demands. Protecting a third of coastal regions from fishing could allow fish stocks to replenish, ensuring adequate supplies for human consumption. Lastly, Attenborough encourages dietary shifts toward plant-based foods to optimize land use. He cites successful government initiatives, like those in Costa Rica reversing deforestation, fishing regulations in Palau, and land management improvements in the Netherlands as exemplary case studies for restoration efforts.