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#Environment190

New method turns sewage sludge into renewable natural gas — Level B2 — aerial view of city during daytime
26 Apr 2026

New method turns sewage sludge into renewable natural gas

A pilot study tested a pretreatment for sewage sludge that produced more renewable natural gas and cut disposal costs. The process uses heat, pressure and a newly found bacterium to make nearly pure methane and reduce waste.

Photo by Marcin Jozwiak, Unsplash

Guanacaste: water, tourism and development — Level B2 — Ocean waves meet a coastal town with mountains beyond.
21 Apr 2026

Guanacaste: water, tourism and development

Guanacaste is Costa Rica's driest province and attracts tourists and foreign buyers. Rapid coastal development has increased water shortages, pollution and local protests, while officials and studies warn aquifers and ageing water systems are under pressure.