Can I add a channel to a specific conda environment?

Update

As of Jan 2017, it was not possible to add a channel to a single conda environment. As of Dec 2020, this is now possible as described in Christopher Barber's answer.

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Alternative

If you instead want to install a package from a specific channel but do not want to add that channel to the global ~/.condarc file, you should use the option to install a package from a specific channel:

conda install <some-package> -c glotzer

As of conda 4.2, environment-specific .condarc files are supported and you can write:

conda config --env --add channels glotzer

to add the channel to the configuration for the active environment.

[Not sure whether --env flag was added in 4.2. Answer based on conda 4.5.9]