Expressing concern over the Centre's plan to link all major rivers in the country by the year 2043, the Supreme Court today asked the Government to immediately constitute a task force to consider achieving it by 2012 to effectively control flood and drought situations. A bench comprising Chief Justice B N Kirpal, Justice Y K Sabharwal and Justice Arijit Pasayat made this observation while saying that the task force would work out the modalities for creating the National River Network (NRN).