A problem with the bullish crossover strategy is that just because the price crosses above or below the moving averages, it doesn't mean a trend is going to commence in that direction. (traderhq.com)
The rate of change of the trend - line will likely become negative within the next 20 years, reaching the lowest global mean trend - line temperature in almost 40 years. (wattsupwiththat.com)
At a minimum, one would need to argue for a distinction between tropical mean trends and trends in the regions of deep convection. (gfdl.noaa.gov)