Dr. Hannah Ritchie

Hannah completed her PhD in GeoSciences at the University of Edinburgh.

27 posts

Outdoor Air Pollution

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 12, 2025 — 20 min read

Outdoor air pollution is one of the world’s largest health and environmental problems.

Oil Spills

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 11, 2025 — 3 min read

The International Tanker Owners Pollution Federation (ITOPF) maintains a database on oil spills caused by tankers, combined carriers and barges since 1970. The data covers the entire planet.

Ozone Layer

by Dr. Max Roser and Dr. Hannah Ritchie in OWD Dec 10, 2025 — 22 min read

Natural Disasters

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 9, 2025 — 25 min read

Land Use

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 8, 2025 — 10 min read

Indoor Air Pollution

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 7, 2025 — 12 min read

Fossil Fuels

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 6, 2025 — 21 min read

Environmental impacts of food production

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 5, 2025 — 30 min read

CO₂ and Greenhouse Gas Emissions

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 3, 2025 — 10 min read

Clean Water

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 3, 2025 — 7 min read

Air Pollution

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 2, 2025 — 6 min read

Access to Energy

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Dec 1, 2025 — 9 min read

Threats to Wildlife

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 27, 2025 — 6 min read

Biodiversity and Wildlife

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 26, 2025 — 8 min read

Mammals

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 25, 2025 — 46 min read

Birds

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 24, 2025 — 9 min read

Fish

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 23, 2025 — 6 min read

Coral Reefs

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 22, 2025 — 50 min read

Living Planet Index

by Dr. Hannah Ritchie and Dr. Max Roser Nov 21, 2025 — 19 min read

Extinctions

by Dr. Hannah Ritchie and Dr. Max Roser Nov 20, 2025 — 27 min read

Poaching and Wildlife Trade

by Dr. Hannah Ritchie and Dr. Max Roser Nov 19, 2025 — 9 min read

Habitat Loss

by Dr. Hannah Ritchie and Dr. Max Roser Nov 18, 2025 — 16 min read

Protected Areas and Conservation

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 17, 2025 — 17 min read

Water Use and Stress

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 16, 2025 — 11 min read

Sanitation

by Dr. Max Roser and Dr. Hannah Ritchie in OWD Nov 15, 2025 — 7 min read

Renewable Energy

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 14, 2025 — 11 min read

Plastic Pollution

by Dr. Hannah Ritchie and Dr. Max Roser in OWD Nov 13, 2025 — 32 min read

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