In The Great Maya Droughts, Richardson Gill gathered and analyzed an array of climatic, historical, hydrologic, tree ring, volcanic, geologic, and archeological research, and suggested that a prolonged series of droughts likely caused the Classic Maya collapse.
Dalam The Great Maya Droughts, Richardson Gill mengumpulkan dan menganalisis serangkaian penelitian iklim, sejarah, hidrologi, cincin pohon, vulkanik, geologis, dasar danau, dan arkeologi, dan menunjukkan bahwa kekeringan yang panjang menyebabkan Keruntuhan Maya Klasik.