Man’s history and development endeavours have beenadvancing alongside a trail of ecologicalramifications and climate change. Since prehistoric times, scientists have not recorded an accelerated shiftin the ecologyof the planet during any other epoch beside that of modern man. The paper seeks to explorehow man’s history and developmentaffects ecologyand climate. It uses desk analysis to recollect data fromglobal assessment reportsand runs a One paired Sample Means t-Test, 1 tailed, 8 df, at PearsonCorrelation value 0.458 and 0.5 alpha level. Findings show that, there is globalclimate change, seen inglobal warming trends; andimbalance in ecological footprint, seen in depletion of air, water and landsinks. The t-Test reveals significant net loss of global forest cover.The study also,apparently found that,processes ofdevelopment generally tend to damage ecology. Therefore,the study recommends a refocus tosustainable means of development.