and recovery projects The Chernobyl Exclusion Zone is an environmental recovery area, with efforts devoted to remediation and safeguarding of the reactor site. At the same time, projects for wider economic and social revival of the territories around the disaster zone have been envisioned or implemented. In November 2007, the United Nations General Assembly adopted a resolution calling for "recovery and sustainable development" of the areas affected by the Chernobyl accident. Commenting on the issue, UN Development Programme officials mentioned the plans to achieve "self-reliance" of the local population, "agriculture revival" and development of ecotourism. However, it is not clear whether such plans, made by the UN and then-President Victor Yushchenko, deal with the zone of alienation proper, or only with the other three zones around the disaster site where contamination is less intense and restrictions on the population are looser (such as the district of Narodychi in Zhytomyr Oblast). Since 2011, tour operators have been bringing tourists inside the Exclusion Zone (illegal tours may have started even before). Tourists are accompanied by tour guides at all times and are not able to wander too far on their own due to the presence of several radioactive "hot spots". Pripyat was deemed safe for tourists to visit for a short period of time in the late 2010s, although certain precautions must be taken. In 2016, the Ukrainian government declared the part of the exclusion zone on its territory the Chernobyl Radiation and Environmental Biosphere Reserve. It was reported in 2016 that "A heavily contaminated area within a 10-kilometer radius" of the plant would be used for the storage of nuclear waste. The IAEA carried out a feasibility study in 2018 to assess the prospect of expanding the local waste management infrastructure. In 2017, three companies were reported developing plans for solar farms within the Chernobyl Exclusion Zone. The high feed-in tariffs offered, the availability of land, and easy access to transmission lines (which formerly ran to the nuclear power station) have all been noted as beneficial to siting a solar farm. The solar plant began operations in October 2018. In 2019, following a three-year research project into the transfer of radioactivity to crops grown in the exclusion zone conducted by scientists from UK and Ukrainian universities, one bottle of vodka using grain from the zone was produced. The vodka did not contain abnormal levels of radiation because of the distillation process.