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This is not the result one would expect if human-generated greenhouse gas emissions, which have constantly increased, inevitably caused temperatures to rise.
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Actually it's exactly what the models that take in all natural and human forcings predict. We aren't just pumping CO2, methane, and other greenhouse gases into the air. At the same time we're pumping out sulfate aerosols that also cool the planet. The drops and rises in the observed trends are linked to changes in the relative production of sulfates and greenhouse gases.
It's also not true that temperatures leveled off in the 1990's. When the data is normalized and the impact of exceptional years like 1998 is reduced the trend is still an increase.