Is Tech Making new sash windows replacement Better or Worse?

http://greenambassadors.org.uk/Eight-Reasons-Why-You-Should-Not-Fail-To-Remember-Aluminium-Windows-.html

In summary, the new EPC rules are obviously an inconvenience, but there are plenty of ways to take advantage of the situation, and its certainly true that draught proofing will have a positive effect on the environment.