Enjoy today’s Cryptogram challenge

Puzzle:
GAJ XWA QJJ RUGH QBWXJ YGT CYJ YZHWA UWXJ YWQ XYWASJM CYJ JWUCY. AJWUKN WKK GR CYJ WPWLKWVKJ KWAM YWQ VJJA XKJWUJM GR RGUJQC WAM LQ AGT ZQJM RGU WSULXZKCZUJ GU ZUVWA MJPJKGBHJAC. JEBKGLCWCLGA GR CYJ BKWAJC LQ UJWXYLAS W XULCLXWK KLHLC. TJ XWAAGC XGACLAZJ CG BGKKZCJ CYJ WCHGQBYJUJ, BGLQGA CYJ GXJWA WAM JEYWZQC CYJ KWAM. — QCJBYJA YWTOLASClue: Change C to M
Solution to previous Puzzle: (select the yellow text with your cursor to read):
ONE CAN SEE FROM SPACE HOW THE HUMAN RACE HAS CHANGED THE EARTH. NEARLY ALL OF THE AVAILABLE LAND HAS BEEN CLEARED OF FOREST AND IS NOW USED FOR AGRICULTURE OR URBAN DEVELOPMENT. EXPLOITATION OF THE PLANET IS REACHING A CRITICAL LIMIT. WE CANNOT CONTINUE TO POLLUTE THE ATMOSPHERE, POISON THE OCEAN AND EXHAUST THE LAND. — STEPHEN HAWKING
HAL'S CRYPTOGRAM HELPER