Thinking about a world without oceans paints an unattractive image of a place that lacks beauty along with life. Oceans occupy the largest space and contain the largest number of living organisms. From space, oceans give the earth a radiant blue color that makes it beautiful and attractive without it the earth would be just dark. Imagining a beach without a large body of water makes it no longer fun, but makes it a void space that is lacking a call for experience. Oceans are not just known for enjoyment, but hold large species of seafood that feed millions of people, provide livelihoods, as well as regulate world temperatures.
With the earth being third from the sun, it receives sun rays in a fraction that cannot be considered to be in the right range, unlike the way Mars is perfectly placed, not too far not too close. The harmful sun rays are absorbed, reflected, and consequently redirected by the oceans. Without the vast mass of water, the harmful sun rays would overheat the equator and not send enough heat to the poles. The ocean helps distribute heat energy across hemispheres through its currents so that no place is hotter for longer than it can handle. Oceans are vital to climate variability since they heavily influence heat, carbon as well as moisture in the atmosphere. Heat absorbed from the sun is later released slowly over months or years, influencing aerosols that promote cloud cover.
A world without oceans is a word without a cloud in the sky. Billions would helplessly search for shade to protect their skin from harmful UV rays but find none. The clouds carry rain therefore without oceans, the planet would just be in drought throughout the years. Whether there are lakes or rivers, they would not provide enough water for the world. The water from rivers, lakes, or ice caps is not enough to cater to a population of 7 billion people, they would only flow to a vast empty land once occupied by oceans, and dwindle into nothingness. Many species of fish would leave behind bones, dried up next to dead coral leaves. Even though some follow a pescatarian diet, homesteads that rely on seafood as their staple food, especially communities that live along the coast, would not have enough food to feed everyone.
Dolphins, whales, sea lions, sharks, starfish, along with all other beautiful marine life would be gone, nothing but dust left. Without oceans, there would be no more swimming with dolphins or surfing on the waves, watching whales, or discovering a new family of sea life. However, with the water gone, the land underneath would be open for exploration. Oceans were said to have formed after a shift in tectonic plates so with them gone, people would have an opportunity to discover the migration routes that were once used to travel across continents.
Several sunken mountains are hidden beneath oceans because it remains an untouched frontier. Trade will be reduced immensely as several countries rely on oceans to ship their goods across the planet. The economy, as well as climate, would take a 180-degree turn from what we are all accustomed to.