In an era defined by proliferating wars, ecological collapse, and nuclear peril, the fundamental question of hope becomes an urgent, shared concern across worldviews. This paper offers a Marxist contribution to a Christian-Marxist dialogue on hope, arguing that any viable future -socialist or otherwise - is contingent upon achieving peace and planetary survival. Moving beyond superficial conceptions, the analysis first addresses hope as a contested political signifier. It then traces the Marxist conception, rooted not in eschatology but in a critical social science that identifies the root of human degradation in alienating social relations, particularly the commodification of labour and nature under capitalist property regimes. Emancipation, therefore, lies in superseding this logic, establishing an economy subordinated to human purpose. Crucially, the paper seeks common ground by highlighting a profound ethical convergence with Christian thought: the "preferential option for the poor" as active subjects of history. Both traditions, from Marx's "class with radical chains" to papal encyclicals, call for listening to the oppressed and abolishing the structural causes of their deprivation. This shared listening to the "cry of the poor" forms a vital bridge in the dialogue. However, the paper concludes that all emancipatory and theological hopes now stand under a severe caveat. With the Doomsday Clock at its most ominous, rampant rearmament and war directly threaten any possible future. Therefore, the precondition for hope is collective political action to impose disarmament and diplomacy. As evidenced by global solidarity movements, hope resides in the power of mobilised peoples to curb the drivers of war and ecological destruction, making conscious human intervention the ultimate, shared source of possibility.