Global Environment. Climate and microorganisms -- Microorganisms, actors in the environment -- Relationship between microbial energy production and material cycles -- Carbon cycle -- Environmental chemicals -- Microbial degradation of pollutants -- The microbial nitrogen cycle -- Cycles of sulfur, iron and manganese -- Heavy metals and other toxic inorganic ions -- Microorganisms at different sites: living conditions and adaptation strategies -- Microbial communities. Structural and functional analyses with classical approach -- Microbial communities. Structural and functional analyses with molecular biological approach -- Damage to inorganic materials by microbial activities, biocorrosion -- Biological wastewater treatment -- Biological exhaust air treatment -- Biological soil remediation -- Biological waste treatment -- Biotechnology and environmental protection -- Food for thought.