Student seeks volunteer work opportunity

I am looking for three or four weeks of unpaid volunteer work in and around Amsterdam from July to mid-August, and want to reach out to anyone in need of project assistance. I am a masters student in International Development, with a professional interest in micro-sustainability and energy efficiency projects, who will be attending a certificate course in Rotterdam over the summer. I would very much like to extend my stay by performing volunteer work for a sustainability practitioner.

I would be happy to assist in any way, from unskilled labor to field data collection, so please feel free to contact me!