I found that the Earth Hour countdown on Bloggers toolkit on http://wwf.ca/earthhour/toolkits/ did not work on a Google Blogger/blogspot blog.
I hosted the files on my site and tried to add the <HEAD> part into the Blogger template but got this problem.
Please correct the error below, and submit your template again.
Your template could not be parsed as it is not well-formed. Please make sure all XML elements are closed properly.
XML error message: The reference to entity "c2e_month" must end with the ';' delimiter.
You can for a few more days see the end result on the left side of this blog or below.