How to Live on Earth | Feature Documentary | Presented by Benedict Cumberbatch

Summary

The documentary argues that humanity can support a thriving future by working with nature rather than treating it as a resource to extract. It frames the challenge around three questions: how to value nature, feed future populations, and maintain human well-being.

Nature’s Connections and Value

• In a major pear-growing region, farmers collect and distribute flower pollen by hand because pesticides have reduced natural pollinators. The film notes that pollinators are needed for about 75% of cultivated crops.
• Indigenous knowledge emphasizes that people and nature are interconnected. The documentary contrasts this perspective with economic systems that often value nature for its extractable parts rather than for the living systems it sustains.
• Elephants act as “landscape engineers”: they clear vegetation, help maintain grasslands and waterholes, and contribute to ecosystems that store carbon. In one protected area, the elephant population reportedly doubled over two decades after severe poaching.
• Forests are more than collections of trees. Mycelium networks can move nutrients among trees, while animals also carry nutrients through ecosystems. For example, salmon carcasses can transfer ocean-derived minerals inland. The film argues that tree plantations do not function like natural forests.
• Biodiversity is presented as a measure of the health of populations, species, and ecosystems—and as something fundamental to planetary and human stability.

Food Production and Land Use

• Agriculture, especially livestock production, is identified as a major driver of habitat loss. The film describes how demand for meat contributes to forest clearing and puts pressure on land and water.
• Alternatives include cacao grown under replanted forest cover, proteins made from mycelium, and protein produced from air-derived ingredients. The film presents these as ways to reduce land use and suggests that blended products could retain familiar meat flavors.
• Eating certain invasive or overabundant animals—such as lionfish, feral pigs, goats, or deer—may help reduce ecological damage in some places.
• The documentary argues that food choices and financial incentives can influence whether land is cleared or conserved.

Ecosystem Services and Finance

• The film describes ecosystem services such as clean water, pollination, fertile soil, carbon storage, and reduced flood risk. These benefits are often not reflected in conventional markets.
• Economist Douglas Edgar explains a proposed model in which “natural asset companies” measure ecosystem services and allow investors to fund ecosystems. In the example discussed, a community could retain its wetland and earn income by protecting it rather than selling the land for a one-time payment.
• The broader proposal is to make living nature visible and valuable to financial systems, so that conservation and restoration can compete with extractive uses.

Rivers, Wildlife, and Restoration

• Gold mining in a river basin is shown as a source of mercury pollution. Because mercury can persist in the environment, contamination threatens people and wildlife downstream.
• On the Klamath River, dams blocked salmon migration and contributed to stagnant, warming water where fish disease spread. A major fish kill in 2002 reportedly left more than 80,000 adult Chinook salmon dead.
• After a long legal effort, four dams were removed and hundreds of miles of habitat were restored. Salmon reportedly reached spawning grounds more than 200 miles upstream in the first year after removal.

Reef Restoration Methodology

Marine biologist Steve Simpson and researcher Mary Shadipo demonstrate an approach that combines habitat restoration, fish recruitment, and sound:

1. Cut fragments from heat-tolerant corals, grow them in tanks, and attach them to the reef.
2. Capture young fish in light traps and raise them in aquariums to improve their chances of survival.
3. Place the grown corals on the reef and protect settling fish with a net.
4. Add farming damselfish, which defend coral from animals that eat it.
5. Play recordings of healthy reef soundscapes, which can help attract coral larvae and young fish.

The approach reflects the relationship between corals and fish: corals provide habitat, while fish help perform functions that support reef health. The film also describes underwater sound as a way to assess reef biodiversity; a bleached, degraded reef can become acoustically quiet.

Nature and Human Well-Being

• A prison turtle-care program illustrates how caring for wildlife can give incarcerated people a sense of purpose and connection. The film reports that prisons with nature programs have found reduced violence.
• Forest-based programs in South Korea are presented as a way to help city residents, particularly students, cope with stress.
• Singapore is shown as an example of integrating greenery and wildlife into urban spaces, including buildings, waterways, and a hospital. The film connects access to nature with health and well-being.

The documentary concludes with a four-stage idea of planetary history: a planet before life, life evolving, intelligent life threatening planetary systems, and—potentially—intelligent life becoming wise enough to work positively with nature. Its proposed path forward is to link economies to biodiversity, produce food with less ecological damage, and recognize that human flourishing depends on healthy ecosystems.

Researchers and Sources Featured

• Dan O’Neal — Biologist studying forest ecosystems and wildlife.
• Sam Kass (rendered as “San Cass” in the subtitles) — Food-system expert and chef, described as a former senior policy adviser and White House chef.
• Douglas Edgar — Developer of natural-asset investment approaches.
• Professor Steve Simpson — Marine acoustics biologist.
• Mary Shadipo — Marine biologist and soundscape collaborator.
• Mr. Park — Runs forest-healing programs in South Korea.
• Shia Bastida (name rendered this way in the subtitles) — Member of the Otomí people and a source on ancestral knowledge and environmental change.
• Klamath River tribal members and fisheries workers — Sources on salmon, river health, and dam removal.
• Manuel — Cacao farmer featured in a segment on forest-compatible farming.
• Greg — Chef featured in testing alternative-protein foods.
• An unnamed economist — Discusses valuing living nature and ecosystem services.
• Local residents and community members — People affected by gold mining and wetland development.
• Benedict Cumberbatch — Presenter and narrator.