There is no scientific doubt that matters regarding Greenhouse Gas emissions. Perhaps there are those that don't 'get it.'

This is called redundancy. Four separate sound scientific agencies have compiled their data to find a common thread to CONFIRM greenhouse gas emissions and the role of those greenhouse gases in driving the warming climate of Earth we are now experiencing.

There is no doubt. 

NONE.

Greenhouse gases are causing a dangerous increase in Earth's tropospheric temperatures.

Scientists at NASA’s Goddard Institute for Space Studies (GISS) (click here) say 2012 was the ninth warmest year since 1880, continuing a long-term trend of rising global temperatures. The ten warmest years in the 132-year record have all occurred since 1998. The last year that was cooler than average was 1976....

...The line plot above shows yearly temperature anomalies from 1880 to 2011 as recorded by NASA GISS, the National Oceanic and Atmospheric Administration (NOAA) National Climatic Data Center, the Japanese Meteorological Agency, and the Met Office Hadley Centre in the United Kingdom. All four institutions tally temperature data from stations around the world and make independent judgments about whether the year was warm or cool compared to other years. Though there are minor variations from year to year, all four records show peaks and valleys in sync with each other. All show rapid warming in the past few decades, and all show the last decade as the warmest.

Because the Hapless Congress doesn't "Get It" doesn't mean it isn't real. No one expects any member of Congress to run the data and concur. The agencies the citizens / taxpayers have funded for decades already did that.

These are highly qualified scientists that have worked with climate data most of their lives and careers. All the Hapless Congress needs to understand is that Greenhouse gases are increasing in redundancy and it is causing dangerous climate trends of Earth. 

That's all.

Don't need to understand anything else. 

The doubt is over and it is time to get on with it.

Carbon dioxide traps heat and largely controls Earth’s climate. It occurs naturally but is also released by the burning of fossil fuels for energy. The level of carbon dioxide in Earth’s atmosphere has been rising consistently for decades, largely driven by increasing man-made emissions.... 

...The carbon dioxide level in the atmosphere was about 285 parts per million in 1880, the first year of the GISS temperature record.... 

...By 1960, the atmospheric carbon dioxide concentration, measured at NOAA’s Mauna Loa Observatory, was about 315 parts per million. 

Today, that measurement exceeds 390 parts per million.

It all correlates. No doubt. In redundancy.