Prime purpose of this lecture is to present on Global Warming in terms of Scientific research. The planet is not warming in the dramatic manner the alarmists claim. There are many other sites that demonstrate cooling. Warming precedes CO2 increase – likely due to warming of the oceans. Water vapour is the strongest greenhouse gas. For these reasons and because the transition between the various phases absorb and release so much energy, water vapour is central to the climate and its variability and change.