This book presents important research advances in the study of environmental research, as well as grassland biodiversity, agricultural runoff, biodiversity hotspots, estuaries, freshwater ecosystems and conservation of natural resources. Topics discussed herein include sustainable waste management; carbon sequestration in soil; effects of habitat destruction on populations and communities; natural renewable water resources; economics of fisheries; biodiversity of tropical freshwater plankton; and ecosystem functioning of open/closed estuaries.