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Sea level rise is accelerating. The number of large wildfires is growing. Dangerous heat waves are becoming more common. Extreme storm events are increasing in many areas. More severe droughts areoccurring in others.
These are just some of the consequences of global warming, which are already having significant and harmful effects on our health, our environment, and our communities.
Unless wetake immediate action to address global warming, these consequences will continue to intensify, grow ever more costly, and increasingly affect the entire planet — including you, your community, andyour family.
Global warming is happening now.
The planet's temperature is rising. The trend is clear and unmistakable.
Every one of the past 37 years has been warmer than the 20th century average.The 12 warmest years on record have all occurred since 1998. 2012 was the hottest year ever recorded for the contiguous United States.
Globally, the average surface temperature has increased more thanone degree Fahrenheit since the late 1800s. Most of that increase has occurred over just the past three decades.

LA CAPILARIDAD
La capilaridad es una propiedad de loslíquidos que depende de su tensión superficial, la cual, a su vez, depende de la cohesión o fuerza intermolecular del líquido y que le confiere la capacidad de subir o bajar por un tubo capilar.
Cuando unlíquido sube por un tubo capilar, es debido a que la fuerza intermolecular o cohesión intermolecular entre sus moléculas es menor que la adhesión del líquido con el material del tubo; es decir, es unlíquido que moja. El líquido sigue subiendo hasta que la tensión superficial es equilibrada por el peso del líquido que llena el tubo. Éste es el caso del agua, y esta propiedad es la que regulaparcialmente su ascenso dentro de las plantas, sin gastar energía para vencer la gravedad.
Sin embargo, cuando la cohesión entre las moléculas de un líquido es más potente que la adhesión al capilar,...