A wetland is a marshy land area like swamps or mangroves that has water either permanently or seasonally and which could also have a distinct ecosystem.
A bench headed by Justice Madan B Lokur asked the Centre to inform it about the status of funds disbursed by them to the states for preservation of wetlands and also about how these have been spent by the states.
"This wetlands issue deserves much serious attention. If there are no wetlands left, it will affect agriculture and several other things. It is a very, very important issue," the bench, also comprising Justices S Abdul Nazeer and Deepak Gupta, told the counsel appearing for the Centre.
Advocate Gopal Sankaranarayanan, appearing for petitioner M K Balakrishnan, said that several states have not complied with the court's direction to inform the Ministry of Environment, Forests and Climate Change about the amounts received by them towards wetlands preservation along with the audit reports and impact of the expenditure incurred by them.
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"Wetlands are vanishing in our country. This is a matter related to water conservation which is very necessary," he said, adding that earlier, there were around 600 lakes in Bengaluru but the number has now come down to around 40.
The bench also referred to its earlier order and said that 2,01,503 wetlands in the country would continue to be protected by the government.
It asked the states to comply with its earlier direction within four weeks and warned that non-compliance would invite imposition of cost as well as summoning of top officials.
The court, which listed the matter for hearing after four weeks, also said that a senior official from the environment ministry should be present on the next date of hearing.
It had also directed various high courts to monitor the management of 26 sites identified in the Ramsar Convention of 1971 on wetlands, till there was some visible improvement as these were international heritage.
The Ramsar Convention on Wetlands of International Importance is an international treaty for conservation and sustainable use of wetlands. It is named after the city of Ramsar in Iran, where the Convention was signed in 1971.
Central agencies have identified over two lakh wetlands in the country through satellite imagery made by the Indian Space Research Organization (ISRO), which had in 2011 prepared a national wetlands atlas and 2,01,503 wetlands were mapped.
The apex court had asked the Centre to inventorise all 2,01,503 wetlands to protect them and notify them in consultation with the state governments.
It had emphasised the importance of conservation of wetlands, saying these were of "immense ecological importance" and there was no justification for the Centre not taking any prompt action.