<p>The WMO Statement on the Status of the Global Climate in 2015 covers many aspects of the climate system, including atmospheric and ocean conditions, El Niño, the cryosphere, greenhouse gas concentrations, regional extremes, tropical cyclones and ozone depletion.</p>
<p>The Statement draws on in situ and space-based observations collected through various WMO and co-sponsored programmes. It also draws on numerical objective analyses.</p>
<p>These observations are the Essential Climate Variables that have been defined by the Global Climate Observing System.</p>
<p>[adapted from source]</p>