One Planet, 17 Goals: Geography and the SDGs

Imagine you are 40 years old. The global population is expected to reach around 9.7 billion people by 2050. Everyone will need food, clean water, energy, and a safe place to live — all on the same planet we have today. Here is the challenge: Earth's resources are not infinite. Some of them, like rainforests and clean groundwater, can be used up faster than they can recover. So the big question is: how do we meet the needs of everyone alive today without making life impossible for people who are not yet born?

Sustainability means using resources in a way that can continue indefinitely — meeting today's needs without destroying the ability of future generations to meet their own. Geographers care deeply about sustainability because where people live, what resources surround them, and how their land is managed all affect whether communities can thrive long-term. In 2015, all 193 member states of the United Nations agreed on 17 Sustainable Development Goals (SDGs) — a shared to-do list for the planet, with a target deadline of 2030. The goals cover three interconnected pillars: people (e.g. ending poverty and hunger), planet (e.g. protecting life on land and in oceans), and prosperity (e.g. clean energy and decent work). Geography is woven through nearly every SDG. Consider SDG 6 (Clean Water and Sanitation): access to clean water depends on a country's rainfall patterns, river systems, aquifer levels, and infrastructure. Sub-Saharan Africa has many regions where rivers are seasonal and groundwater is deep — meaning SDG 6 progress is slower there than in countries with reliable rainfall and well-funded pipe networks. Or take SDG 13 (Climate Action): low-lying island nations such as Tuvalu in the Pacific Ocean face sea-level rise that threatens their very existence — yet they contribute less than 0.01% of global greenhouse gas emissions. This geographic injustice — being harmed most by a problem you least caused — is central to sustainability debates. SDGs do not work in isolation. SDG 2 (Zero Hunger) links to SDG 15 (Life on Land): if forests are cleared for farmland, biodiversity falls and soils can degrade, eventually reducing food security. Geographers call these trade-offs, and spotting them is a key skill. Worked example — Costa Rica and the SDGs: Costa Rica is a small Central American country covering roughly 51,000 km². Despite being a developing nation, it generates over 99% of its electricity from renewable sources — mainly hydropower and geothermal energy from its volcanic landscape (SDG 7: Affordable and Clean Energy). It has also reforested more than half its territory since the 1980s, boosting biodiversity (SDG 15). This success is partly geographic: Costa Rica sits on a volcanically active zone with abundant rivers and reliable rainfall, making renewables feasible. It shows that geography can be an advantage — if a country chooses to use it sustainably.