问题：
使用conda安装gdal后，在回滚变更环境后出错：geoio ImportError: libpoppler.so.71: cannot open shared object file: No such file or directory
解决方案：
conda install “poppler<0.62”
参考：
https://blog.csdn.net/weixin_43869493/article/details/109115595
https://github.com/ContinuumIO/anaconda-issues/issues/9449
