1 23 International Journal of Biometeorology ISSN 0020-7128 Volume 58 Number 3 Int J Biometeorol (2014) 58:395-405 DOI 10.1007/s00484-013-0635-1 Estimating climate change, CO 2 and technology development effects on wheat yield in northeast Iran M. Bannayan, H. Mansoori & E. Eyshi Rezaei