According to the 1990 IPCC Report, an additional 0.5C global warming would need to be observed before natural variability could be distinguished with high confidence from an "enhanced greenhouse effect" due to man-made emissions. However, as an article today at Reason.com points out,
"...enhanced greenhouse warming above the noise of natural climate variability would not yet have crossed over the benchmark (+0.5°C) set by the IPCC back in 1990. Interesting."
Satellite data indicates only ~0.2C warming since 1990, considerably short of the 0.5C threshold the IPCC set for itself in 1990 to determine whether additional global warming was within natural variability.
CNBC: "Extreme weather such as hurricanes, flooding, freezing temperatures and wildfires has prompted some to rethink where they will spend their golden years...Another client in Austin suffered from the region’s deep freeze and power outages in February. When pipes froze and their condo flooded, they started to question their long-term plans, McGlothlin said.With the possibility of another cold snap, more home damage or future displacement, they are reconsidering where they are living."