By Syful Islam DHAKA, Bangladesh (AlertNet) - Worsening sea water storm surges and overuse of irrigation have left fields, wells and ponds in parts of southern Bangladesh too salty to grow crops, leading to a growing exodus of farmers from the region.

GENEVA — The UN warned on Monday that "massive" loss in life-sustaining natural environments was likely to deepen to the point of being irreversible after global targets to cut the decline by this year were missed. As a result of the degradation, the world is moving closer to several "tipping points" beyond which some ecosystems that play a part in natural processes such as climate or the food chain may be permanently damaged, a United Nations report said.

The world's forests, which cover a third of Earth's land area, provide us with many essential services. They absorb carbon dioxide from the atmosphere and give us oxygen, limit soil erosion, aid in flood control and aquifer recharge, and host a wealth of biodiversity. But as human populations have grown, so, too, have the demands placed on these natural systems.

Species classified by the International Union for Conservation of Nature (IUCN) as "threatened" increased by 2.1 percent in 2009, as 365 species were added to the organization's Red List of Threatened Species. Only 2 species were removed from the list. Since 1996, a total of 47,677 species of animals, plants, fungi, and protists (a group that includes protozoans and most algae) have been evaluated by the IUCN, and 17,291 of these are now considered threatened—a full 36 percent.

• Climate change hurting African crop yields
• Farmers complain rains no longer predictable
• Africa needs development to adapt, experts say

By Tim Cocks and Loucoumane Coulibaly ABIDJAN, April 20 (Reuters) - From Africa's humid jungles and cocoa plantations to its growing semi-deserts and wilting maize fields, erratic weather linked to climate change may be ruining subsistence crops and export commodities alike.