Original sentence: Environmentalists say that these "qualitative reconstructions", combined with "attribution analysis", indicate that it is likely this is due to human activity (see anthropogenic climate change).Other historical evidence show patterns of warming and cooling, which correlate with sunspots and other aspects of solar activity; thus, some historians argue that the Medieval Warm Period enabled the colonization of Greenland.Some selections of data show temperatures as having been roughly stable for the last 1,000 years but sharply rising in the last century (see Temperature record of the past 1000 years).The choice of data presented matters, because it affects how the most recent years are viewed: the date selected by the IPCC show a recent warming trend, which they call unusual; records overlooked or left out by the IPCC show no such unusual trend; thus, "skeptics" reject calls for actions such as the Kyoto Protocol (see global warming controversy, Maunder Minimum, Little Ice Age, Sargasso Sea proxy).Thus they generally urge quick and radical action to "save" the environment (see Kyoto Protocol)
Edited sentence: Environmentalists have been quick to believe this and generally urge quick and radical action to save the environment (see Kyoto Protocol).Qualitative historical evidence show patterns of warming and cooling, which correlate with sunspots and other aspects of solar activity; thus, some historians argue that the Medieval Warm Period enabled the colonization of Greenland.Some quantitative reconstructions show temperatures as having been roughly stable for the last 1,000 years but sharply rising in the last century (see Temperature record of the past 1000 years).The difference between the qualitative and the quantitative matters, because it affects how the most recent warming is viewed: the quantitative records show the recent warming trend, and the current warmth, as unusual; from the qualitative record, many "skeptics" believe that the recent trend is not unusual, and reject calls for actions such as the Kyoto Protocol (see global warming controversy, Maunder Minimum, Little Ice Age, Sargasso Sea proxy).These records, combined with attribution analysis, indicate that it is likely this is due to human activity (see anthropogenic climate change)