In May 2008 in the abortion amendments to the Human Fertilisation and Embryology Bill (now Act), Gregory Barker voted for the abortion time limit to be lowered to 20 weeks against scientific and medical consensus which is currently 24 weeks. After four separate parliamentary votes on varying time limits, the majority of MPs voted to keep the abortion time limit at 24 weeks, in keeping with scientific and medical consensus, hence no abortion amendments were added to the bill.
In 2006, MPs were asked three questions by the Rough Guide's Mark Ellingham on how seriously they took climate change as politicians and as responsible, active citizens. Gregory Barker replied:
- "Climate change is the most important challenge that humankind will face this century. Unless we act seriously and with urgency we will be failing in our duty to future generations."
Barker has signed a number of Early Day Motions indicating that he agrees that climate change is occurring and is primarily due to the release of greenhouse gases. Recent examples include: EDM 98: Climate Change (signed November 2007), EDM 789: Energy And Climate Change (signed January 2008), and EDM 689: Solar Energy (signed February 2009).
Responding to a Parliamentary question from Gary Streeter on the evidence supporting man-made climate change in March 2013, Mr Barker started "The scientific evidence for man-made climate change is considerable and continues to grow."