Have burning questions about Earth's changing climate? Wonder how scientists differentiate human impact from natural causes? Now's your chance to ask a NASA climate scientist

Have burning questions about Earth's changing climate? Wonder how scientists differentiate human impact from natural causes? Now's your chance to ask a NASA climate scientist directly.

Submit your question by recording a 10-15 second video and uploading it to YouTube, or simply post it on Twitter. Ensure you tag your submission with #askclimate so we can find it.

NASA scientists will record video responses to selected questions, which will be posted on the NASAExplorer YouTube channel.

During NASA's #askclimate campaign, a Twitter user posed a question to Goddard Space Flight Center's Molly Brown: "Will

During NASA's #askclimate campaign, a Twitter user posed a question to Goddard Space Flight Center's Molly Brown: "Will climate change drastically reduce our food production, or will it change what we produce?"

For further details on climate variability and food production, explore NASA's article: Climate Forecasts Warn of Crop Failures.

Studies indicating historical CO2 levels lag behind temperature have merit, confirms Peter Hildebrand, Director of Earth Science at NASA's Goddard Space Flight Center. Responding to a question on

Studies indicating historical CO2 levels lag behind temperature have merit, confirms Peter Hildebrand, Director of Earth Science at NASA's Goddard Space Flight Center. Responding to a question on Twitter, Hildebrand explained that in the pre-industrial age, temperature changes drove CO2 levels; a warmer climate caused the biosphere to emit more CO2.

However, in the post-industrial era, this dynamic has reversed. Now, increasing atmospheric CO2 is leading to higher temperatures, indicating a fundamental shift in the physical-biological processes. For more information, visit Ask A Climate Scientist.

JPL scientist Josh Willis, from NASA's Ask A Climate Scientist campaign, asserts that global warming is not pausing, despite some decades showing slower surface temperature

JPL scientist Josh Willis, from NASA's Ask A Climate Scientist campaign, asserts that global warming is not pausing, despite some decades showing slower surface temperature increases.

Willis points to increased ocean heat trapping and continuously rising sea levels as clear evidence. See [global temperature trends](http://climate.nasa.gov/key_indicators#globalTemp) and [sea level records](http://climate.nasa.gov/key_indicators#seaLevel).

While natural fluctuations occur, human-caused climate change is undeniably progressing. Explore more NASA climate science answers [here](http://bit.ly/1b7rSdL).

In a preview of Moyers & Company, climate expert Anthony Leiserowitz draws an analogy between small shifts in global average temperature and slight changes in human body temperature. He explains

In a preview of Moyers & Company, climate expert Anthony Leiserowitz draws an analogy between small shifts in global average temperature and slight changes in human body temperature. He explains that just as a few degrees can signal serious illness, similar small climate shifts can have profound implications.

For more, explore the Climate Change collection on billmoyers.com.

An interview with NASA cryospheric scientist Dr. Tom Wagner, published on August 23, 2013,

An interview with NASA cryospheric scientist Dr. Tom Wagner, published on August 23, 2013, discusses the state of Arctic sea ice.

For more information on NASA's ice research, visit ice.nasa.gov.

The continental U.S. could face an 8-degree Fahrenheit temperature increase by the end of the 21st century if carbon dioxide concentrations reach 800 parts per million. Current CO2 levels stand at

The continental U.S. could face an 8-degree Fahrenheit temperature increase by the end of the 21st century if carbon dioxide concentrations reach 800 parts per million. Current CO2 levels stand at 400 ppm and are rising faster than at any time in Earth's history.

These projections, from the draft National Climate Assessment, are vividly illustrated through computer model visualizations. Allison Leidner, a NASA scientist, emphasizes that these visualizations effectively communicate the dramatic potential changes to the nation's climate, including future temperature and precipitation scenarios.