The dramatic improvements in air and water quality resulting from coronavirus lockdowns have led to calls for a low-carbon future, but the need to restart economies is complicating the environmental outlook. Wildlife has been seen returning to city streets, with wolves, deer, and kangaroos appearing in normally busy areas. Fish have reappeared in Venice canals previously polluted by motor boats, and residents in some Indian cities have reported seeing the Himalayas for the first time in decades. Satellite images show significant air quality improvements in Europe and Asia, including China, but there are concerns that pollution levels will rise again as the economy reopens. "In the latter part of the year, as the epidemic subsides and factories reopen, the weather will gradually worsen," stated Tang Zhiwei, a 27-year-old resident of Shanghai. "Make the most of the clear blue skies while you can." Greta Thunberg emphasized that addressing the coronavirus crisis does not mean the climate emergency has disappeared. She stressed the need to address both crises simultaneously. UN Secretary-General Antonio Guterres urged governments to use their economic responses to the pandemic to also address the urgent issue of climate change. The global battle is brewing between investors supporting "green stimulus" measures and industry lobbyists trying to weaken climate regulations, prompting Guterres to warn governments against bailing out heavily polluting industries. Guterres emphasized the importance of addressing the planet's environmental crisis on Earth Day, alongside the focus on the COVID-19 pandemic. Peter Betts, a former lead climate negotiator, highlighted the need for coronavirus economic stimulus packages to prioritize being "low-carbon, climate-smart". Betts also expressed concern that some governments may prioritize jumpstarting the economy and creating jobs over environmental considerations. US President Donald Trump considers it a top priority to revive America's oil and gas industry and ensure that it remains strong in the future. He tweeted his commitment to supporting these important companies and jobs with a plan to provide funds. Climate change concerns have been increasing, with last year being the hottest on record in Europe due to high levels of greenhouse gases in the atmosphere. C3S director Carlo Buontempo stated that the warming trend is now undeniable worldwide, leading to an increase in the frequency of record-breaking events. The head of the World Meteorological Organization (WMO) mentioned that the coronavirus pandemic is projected to decrease carbon dioxide emissions by 6% this year, marking the largest drop since World War Two. However, the WMO emphasized that this reduction in emissions will not halt climate change, stating that COVID-19 should not be seen as a replacement for ongoing efforts to combat climate change. Due to many people staying at home, air quality has gotten better in China. Emissions in Shanghai decreased by almost 20% in the first quarter, and in Wuhan, where the outbreak began, monthly averages dropped by over a third. However, experts are concerned that this decline may lead China to ignore pollution in order to boost the economy, which experienced its first decline ever in the first quarter.