Sediment cores from Lake Malawi in southern Africa show colder weather from 1570 to 1820.

FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here

They collect sediment in Comet Lake to search for diatoms, microorganisms whose skeletal remains allow scientists to reconstruct past climates.

CNN: Mars 'colonists' undaunted by bad luck, punishing weather

Dr. Kennett and colleagues have published evidence in the prestigious Proceedings of the National Academy of Sciences that a "black mat" from the sediment of a Mexican lake dates to 12, 900 years ago and shows a sudden peak of magnetic and carbon spherules, "nanodiamonds" of a kind known as lonsdaleite, and charcoal: all of it evidence of extreme heat.

WSJ: Matt Ridley on New Support for a Global-Cooling Theory | Mind & Matter

Haas is taking sediment cores from a nearby lake that should tell him about climate changes 5, 000 years ago.

NPR: With Climate Swing, a Culture Bloomed in Americas

An initiative to assess erosion and sediment transport to marine, lake or reservoir environments aimed at the creation of a holistic approach for the remediation and conservation of surface waters, closely linking science with policy and management needs.

UNESCO: International Hydrological Programme (IHP)

The stream now carries black sediment of waste coal which eventually flows into Lake Kariba.

BBC: China in Zambia: Jobs or exploitation?