July 28 (Telegraph) -- A new climate change report that brings together the latest temperature readings, from the top of the atmosphere to the bottom of the ocean, provides the "greatest evidence we have ever had" that the world is warming. Usually scientists rely on the temperature over land, taken from weather stations around the world for the last 150 years, to show global warming. But climate change sceptics questioned the evidence, especially in the wake of recent scandals like"climategate". Now for the first time, a report has brought together all the different ways of measuring changes in the climate. The ten indicators of climate change include measurements of sea level rise taken from ships, the temperature of the upper atmosphere taken from weather balloons and field surveys of melting glaciers. New technology also means it is possible to measure the temperature of the oceans, which absorb 90 per cent of the world's heat. The State of the Climate report shows “unequivocally that the world is warming and has been for more than three decades”. And despite the cold winter in Europe and north east America, this year is set to be the hottest on record. The annual report was compiled by the Met Office and its US equivalent The National Oceanic and Atmospheric Administration (NOAA). Both NOAA and NASA have stated that the first six months of this year were the hottest on record, while the Met Office believes it is the second hottest start to the year after 1998. Dr Peter Stott, Head of Climate Monitoring and Attribution at the Met Office, said “variability” in different regions, such as the cold winter in Britain, does not mean the rest of the world is not warming. And he said 'greenhouse gases are the glaringly obvious explanation' for 0.56C (1F) warming over the last 50 years. “Despite the fact people say global warming has stopped, the new data, added onto existing data, gives us the greatest evidence we have ever had,” he said. Sceptics claimed that emails stolen from the University of East Anglia show scientists were willing to manipulate the land surface temperatures to show global warming. The scientists were cleared by an independent inquiry but the ‘climategate scandal’ as it became known cast a shadow over the case for man made global warming. Dr Stott said the sceptics can no longer question the land surface temperature as other records also show global warming. He pointed out that each indicator takes independent evidence from at least 3 different institutions in order to ensure the information is correct. Despite variations from year to year, each decade has been warmer than the last since the 1980s. "Despite the variability caused by short term changes, the analysis conducted for this report illustrates why we are so confident the world is warming,” he said. “When we look at air temperature and other indicators of climate, we see highs and lows in the data from year to year because of natural variability. Understanding climate change requires looking at the longer-term record. When we follow decade-to-decade trends using different data sets and independent analyses from around the world, we see clear and unmistakable signs of a warming world.” :: Microscopic marine algae which form the basis of the ocean food chain have declined by two fifths in the past 60 years. Research published in the journal Nature said phytoplankton, described as the "fuel" on which marine ecosystems run, were experiencing declines of about 1 per cent of the average total a year. According to the researchers from Dalhousie University in Canada, who constructed a database of almost half a million observations dating back to 1899, the annual falls translate to a 40 per cent drop in phytoplankton since 1950. The reduction in the amount of algae in the seas could have an impact on a wide range of species, from tiny zooplankton to marine mammals, seabirds, fish and humans.